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2007 - 2008 Adopt an Acre® Conservation Site
Costa Rica's Osa Peninsula
Lands of Life
An Invitation to Protect the Osa
Dear Friends:
We are delighted to extend this invitation for you to join us in preserving one of the greatest reservoirs of biodiversity on Earth—the Osa. Nowhere else on the planet does such a small area—about 400,000 acres—
contain so many distinct tropical ecosystems. Located in southwest Costa Rica, the Osa region is a key
component of the Mesoamerican forests and the Eastern Pacific seascape, two of the world’s top 25 diversity
hotspots. As such, it is critical to preserving the biodiversity of the entire Western Hemisphere.
The global importance of this unique region, which faces ever-increasing threats, has led Conservation
International, The Nature Conservancy, the Costa Rica-USA Foundation, and the Government of Costa Rica
to come together in the Osa Campaign, an equally unique conservation and fundraising effort. The
Campaign will conserve the biodiversity of the Osa for future generations by strengthening national parks,
creating biological corridors between them, and involving local communities in conservation efforts both
on land and sea. For nearly three decades, Costa Rica has been a leader in biodiversity conservation.
Through the joint efforts of the government, local and global conservation organizations, and private citizens,
Costa Rica has protected a greater proportion of its biodiversity heritage than any other country.
Despite considerable progress over the last 30 years, much work remains to truly conserve this precious
resource. We believe this unprecedented partnership will build on the conservation successes of the past
and expand them even further, while ensuring that they will endure. We invite you to join us in meeting the
challenges of saving the Osa’s natural treasures.
Sincerely,

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Luis Diego Escalante
President
The CR-USA Foundation for Cooperation |
Carlos Manuel Rodriguez
Minister of Environment and Energy
Government of Costa Rica |
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Steven J.McCormick
President and CEO
The Nature Conservancy |
Peter Seligman
Chairman of the Board and CEO
Conservation International |
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Overview
In the early 1970s, a group of tropical biologists
working on the Osa Peninsula waged a campaign to
create a national park to protect what they realized
was a place of global importance. With swift action
by the Costa Rican National Park Service and help
from The Nature Conservancy and other conservation
groups, Corcovado National Park was created
in 1975. Now encompassing one-third of the peninsula,
Corcovado is the crown jewel in Costa Rica’s
park system. However, scarce resources have created
significant management challenges for the
park, and the park’s few rangers are unable to curb
illegal activities such as poaching, mining and illegal
fishing.
Across the gulf from Corcovado, conservationists
later targeted a second expanse of prime lowland
rainforest on the mainland. If protected, this tract
would complement the forests already conserved
on the peninsula and provide additional habitat for
wildlife. In 1991, the Costa Rican government established
Piedras Blancas National Park with the hope
of eventually connecting it with Corcovado to create
a contiguous wilderness to ensure the preservation
of biodiversity. But today almost half the lands within
the park remain in private hands, still awaiting purchase
by the government. Meanwhile, to the north,
the Térraba-Sierpe national wetland was declared
in 1994 to protect the largest mangrove forest on
the Pacific coast of Central America.
The lands between these three “anchors,” called
the Osa Biological Corridor, represent the critical
connection that holds the key to the Osa’s future.
Only with a secure linkage can the present levels
of biodiversity—including large mammals such
as jaguar, puma, peccaries and tapir—survive, as
growing geographic isolation limits genetic
exchanges among different populations. Almost all
of the land in the Corridor is in private hands, and
many landholders rely on its natural resources for
their livelihoods. Without taking into consideration
the needs of these families and individuals, conservation
success will not be sustainable.
Biologists are also discovering that the Osa’s
ocean environments are as unique and valuable as
those on land, and conservationists are working to
ensure that they are quickly and sufficiently protected.
While land-based conservation efforts have
been under way for a quarter of a century, relatively
little attention has been paid to protecting marine
resources. Meanwhile, rapid tourism development
and escalating pressure on marine populations by
both commercial and sport fishing fleets is seriously
threatening the ecological balance of the
Golfo Dulce and the seas around the Osa.

Located in the southwestern corner of Costa Rica’s Pacific coast, the Osa’s forested peninsula curves sharply from the mainland,
surrounding the deep waters of Golfo Dulce. Maps by Technical Coalition of the Osa Biological Corridor
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Tropical Conservation Innovation

Costa Rica is recognized
throughout
the world as an
innovator in tropical
conservation:
pioneering the
development of
debt-for-nature
swaps and the sale
of carbon bonds to fund conservation efforts, creating
bi-national “peace parks,” prospecting for
economic uses for biological resources, and decentralizing
parks management to promote community
involvement. A strong conservation ethic has arisen
among the citizenry and their elected leaders.
Costa Rica also has a long history of promoting
private conservation. It hosts the world-famous
private Monteverde Cloud Forest Reserve and many
smaller reserves that help make ecotourism a leading
source of income. This success in turn motivates
more landowners to explore the economic potential
of conservation.
The first conservation easement and the first
land trust in Latin America were created in Costa
Rica in 1992. The government promotes private
conservation by paying landowners a fee for the
environmental services that their forests provide
to society, paid for through a tax on gasoline. Costa
Rica is also a leading center for tropical biology
research and education, housing such institutions
as the National Biodiversity Institute (INBio) and
the Organization for Tropical Studies. In short, this
tiny country, smaller than the state of West Virginia,
impacts conservation theory and practice throughout
the world.
The Osa Campaign is yet another innovation.
For the first time, two of the world’s leading conservation
organizations have joined together with the
Costa Rican government and local environmental
groups in a major public-private fundraising initiative.
Not only will the Campaign raise funds from U.S.
and other international donors, but from people and
businesses in Costa Rica as well—a milestone in
environmental philanthropy in the developing world.
GOALS OF THE OSA CAMPAIGN
- Protect biodiversity in the Osa’s parks, wildlife
refuges, wetlands and forest reserves by
improving management and buying private
lands within the parks.
- Connect key natural areas through a “biological
corridor” between Corcovado and Piedras
Blancas National Parks.
- Establish the first comprehensive protection
program for marine and coastal resources in
the Osa.
- Build the capacity of local organizations and
communities to sustain conservation successes.
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Biological Significance
What’s at Stake
The Osa—less than half the size of Rhode Island—
harbors a diversity of habitats and richness of
species unheard of elsewhere for an area of this size.
Corcovado National Park alone contains at least 13
major ecosystems, including lowland forests, cloud
forests, mangrove and freshwater swamps, lagoons,
beaches, and coral reefs. The forests of the Osa are
home to between 4,000 and 5,000 species of vascular
plants, including more than 700 species of trees,
many of which are endangered. Biologists estimate
that between 2 to 3 percent of the flora of the Osa
exists nowhere else on Earth. One study found the
forest to be in natural balance, with no single
species of plant or tree dominating any other—a
clear sign of a robust and healthy ecosystem.
The animal life of the peninsula is as varied and
abundant as its flora. The forests of the Osa host a
wealth of mammals, birds, reptiles and insects—
many found nowhere else in Central America. The
Osa is home to more than 375 species of birds (of
which 18 are endemic), 124 species of mammals,
40 species of freshwater fish, approximately 8,000
species of insects, and 117 species of reptiles and
amphibians. The species recorded in the Osa represent
up to 50 percent of the species known to exist
in Costa Rica. The Osa contains Costa Rica’s largest
population of the endangered scarlet macaw, as
well as Central America’s largest population of
squirrel monkeys.
Large cats such as jaguar, puma and ocelots survive
here, and the protected terrain of Corcovado
National Park is also a critical stronghold for other
wide-ranging mammals such as tapir and whitelipped
peccaries. Peccaries have all but disappeared
from the rest of the country’s Pacific coast, but packs
of up to 80 animals still move through the forest of
Corcovado, serving as the jaguar’s primary prey.
This is the most alarming conclusion of the latest jaguar count carried out by the biologist
and researcher Eduardo Carrillo. This scientist of the National University (UNA) has
warned that at present only 30 individuals inhabit the park.... Ten years ago, the figure
was 150. Authorities of the Ministry of the Environment and Energy (MINAE) are aware
of the situation, but ...recent budget cuts and obstacles to hiring more staff prevent the
Ministry from increasing the patrols and stopping the hunters.”
From Extinction Stalks the Jaguar in Corcovado, La Nacion Newspaper, March 14, 2004 |

The Osa Peninsula is also surrounded by major
aquatic and marine resources. The Terraba-Sierpe
Wetland, to the north of the peninsula, contains
the largest mangrove forest on the Pacific coast of
Central America, and has been designated under
the Ramsar Convention as a site of global significance
for the protection of aquatic birds. The Golfo
Dulce, to the east, is one of only four fjords in the
tropics worldwide, and though little studied, its great
depth and still waters harbor marine environments
unknown elsewhere in the region. The waters to the
west of the Peninsula—where 25 species of dolphins
and whales have been spotted—are prime
habitat for large numbers of marine mammals.
Impressive coral reefs fringe Corcovado National
Park and the Isla del Caño—one of few places
remaining where pristine tropical forest and coral
reefs exist just meters apart. In addition, the
beaches of the Osa Peninsula are important nesting
sites for four of the world’s seven species of endangered
sea turtles.
Although the land and seascapes of the Osa are
still pristine, they are not immune to outside pressures.
While the region’s inaccessibility spared it
from human impact for many years, activities such
as poaching, fishing, logging, and unsustainable
agriculture and unplanned development today
threaten its natural integrity.
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Campaign Results and Activities
The Campaign is made up of four goals with a
total funding need of $32.5 million
CAMPAIGN GOAL 1
Protect biodiversity in the Osa’s parks, wild-life
refuges, wetlands, and forest reserves by improved
management practices.
The work of creating public protected areas—the
core of efforts to protect biodiversity in the Osa—
while under way for over 30 years, is not yet finished.
A mosaic that includes two national parks, wildlife
refuges, protected wetlands, and a forest reserve,
over 400,000 acres in all, has been established by
law. However, these areas and the biodiversity that
they contain still face a formidable array of threats.
For example, Corcovado National Park is besieged
by poachers, to the point where the survival of several
species—including the jaguar—is in doubt.
Scientists have documented frightening declines in
populations of key species. The population of chancho
de monte (white-lipped peccary) has decreased
from 2,000 in the early 1990s to about 400 today,
while the number of jaguars has plummeted from
150 to only 30.
Although Piedras Blancas National Park was created
in 1991, roughly half its lands remain in private
hands. Much of the land within the park’s boundaries
is used in ways that are incompatible with
conservation goals including poaching, deforestation,
and unsustainable agricultural activities. While
Costa Rican law requires that all private lands
within the park be purchased, the government and
its conservation allies have only been able to purchase
half.
Inadequate resources and inefficient administrative
structures also hinder proper management of
the parks and public lands. None of the protected
areas have up-to-date plans to guide natural resource
management and protection decisions. The park
staff lack adequate personnel, equipment and training.
Public funding for the parks fluctuates widely
from year-to-year, making effective planning and
management a challenge at best.
The Campaign will provide assistance to the
Ministry of the Environment (MINAE) to help ensure
the survival of the Osa’s biodiversity on public lands.
The support provided by the Campaign is designed
to supplement, rather than replace, public resources
devoted to conservation in the Osa.
Funds raised will be used to:
- Complete the establishment of the Piedras Blancas
National Park by purchasing 5,000 hectares and
transferring the lands to the government.
- Create management plans for Piedras Blancas
National Park/Golfito Wildlife Refuge, Corcovado
National Park/ Isla del Caño Biological Reserve,
the Golfo Dulce Forest Reserve, Marino Ballena
National Park, and the Terraba-Sierpe National
Wetland.
- In conjunction with internationally recognized
research institutes, design and establish a biological
research and monitoring program to support
natural resource management decisions.
- Build new ranger stations and hire and equip
park rangers to immediately improve control and
enforcement measures against illegal hunting
and fishing.
- Train and equip a corps of community volunteers
(COVIRENAS) to assist park rangers in monitoring
illegal activities.
- Create a $10 million permanent endowment
(Public Protected Areas Endowment Fund) to
provide annual, supplemental funding for park
management.
- Provide management training to park administrative
staff.
GOAL $19 MILLION
CAMPAIGN GOAL 2
Connect key natural areas through the “Osa
Biological Corridor” between Corcovado and Piedras
Blancas National Parks and the Terraba-Sierpe
National Wetland.
Even with adequate funding and improved management,
the public protected areas of the Osa are
too small and isolated to maintain their present
high levels of biodiversity for very long.
Ensuring that there is a functioning biological
corridor—a connecting land bridge where wildlife
can roam and genetic exchanges among populations
can continue—is fundamental to preserving
the region’s biodiversity. However, it is in the
Corridor where the most significant and daunting
threats to the Osa’s ecological resources exist.
The threats include poaching, deforestation,
development, and destructive agricultural practices.
Unclear ownership rights and land tenure conflicts
with the government thwart both conservation
efforts and economic development, and prevailing
attitudes hold that natural resources should be
exploited for greatest short-term benefit. All but a
small portion of this 85,000-hectare area is in private
hands and is populated with several small but
well-established communities. Because of this the
economic and social costs of purchasing these
lands to include them in the parks are too high for
the government and its conservation allies to meet.
New ideas and strategies are needed to stop the loss
of forests and animals while helping meet the needs
of the people who live in the Osa. Accordingly,
funds raised by the Campaign will support the work
of local groups to:
- Create a comprehensive land use plan for the
Corridor, which takes into consideration the
needs of the many stakeholders, including farmers,
businesses and communities.
- Protect or regenerate forest on at least 15,000
hectares of priority lands through private conservation
strategies, including land acquisition,
establishing conservation easements, and innovative
strategies such as payments for
environmental services.
- Create a control and protection program jointly
undertaken by park rangers and volunteers from
local communities (COVIRENAS).
- Promote sustainable agriculture and microenterprise
projects compatible with the
conservation goals of the Corridor.
- Undertake scientific research and monitoring to
ensure that conservation activities are well-targeted
and effective.
GOAL $10.53 MILLION

CAMPAIGN GOAL 3
Establish a comprehensive protection program for
marine and coastal resources in the Osa.
The marine environment of the Osa presently
receives very little protection from destructive commercial
fishing practices and coastal development,
both quickly-growing threats to marine life and its
habitats. While a few marine protected areas exist in the Osa, like their land-based counterparts, they are
too small and receive inadequate protection to be
effective for long-term conservation success.
Because commercial fishing takes place in the
open ocean, it is very difficult to regulate and control.
A shortage of personnel, training and patrol
boats means illegal activity can flourish. Furthermore,
official responsibilities for controlling illegal
fishing are spread among several agencies that
must cooperate if efforts to curb this activity are to
be successful.
As the natural charm of the area is discovered and
promoted around the globe, coastal development is
rapidly rising to meet the needs of ever-increasing
numbers of tourists. While most coastal development
in the Osa has been small-scale and environmentally
benign (and often very helpful, as eco-lodges
establish nature reserves, create jobs and raise
awareness), the cumulative effect of many small
developments is beginning to have an impact, exacerbated
by a lack of planning. And initiatives to build
much larger projects with proportionately higher environmental impacts will soon be under way.
Effective planning of coastal development to reduce
environmental impacts of development and the
application of existing restrictions must begin today.
Increasing the protection of fisheries and controlling
coastal development are both goals that will
require a great increase in cooperation and formidable
coordination between the public and private
sectors. Funds from the Campaign will support the
first comprehensive, inter-agency approach to
marine conservation, specifically to:
- Study the feasibility of, and legal and technical
requirements for, establishing new marine protected
areas, (i.e. Golfo Dulce or Isla de Caño-
Marino Ballena Corridor) and expanding
exsiting ones.
- Create the first integrated management plan for
marine and coastal resources in the Osa.
- Design a comprehensive inter-institutional control
and protection strategy.
- Establish an ecological baseline for the region,
including evaluation of populations of commercial
and other key marine species.
- Implement an ongoing monitoring program to
assess the status of populations and inform management
decisions.
GOAL: $ 1.975 MILLION
CAMPAIGN GOAL 4
Build local capacity to sustain conservation success.
The Osa Campaign is an intense international effort
that will attract sizable resources for conservation.
However, to achieve lasting results, the Campaign
must ensure that the people of the Osa embrace the
idea of conserving their lands and marine environments,
support the development of local leaders,
and help local organizations create the capacity
to develop and successfully implement projects
and activities.
This will take time. Attitudes and livelihoods
developed over many generations are not changed
overnight. And while several local organizations
working in the Osa have a great deal of expertise
and proven ability to implement projects, others
have only recently been established. There are
many important stakeholders whose different interests
and priorities must be reconciled in planning
and executing conservation activities. This is particularly
true in the Osa Biological Corridor, where any
effort requires the voluntary cooperation of residents
and landholders. While building widespread
allegiance to common conservation goals will take
much time and effort, it is essential to the
Campaign’s success.
A coalition of local conservation organizations
(the Technical Coalition of the Osa Biological Corridor)
has been working in the Osa since 2000, and
the Campaign’s founding partners are prepared to
devote the time and resources necessary to forge
true local capacity where solutions are welcomed
and eventually undertaken by the residents of
the Osa.
Specifically, the Campaign will raise funds to:
- Promote inter-institutional coordination and
strengthen existing coalitions and partnerships
to develop a common vision for conserving the
Osa.
- Strengthen grassroots organizations in the Osa
by providing training and technical assistance.
- Foster the emergence of local leaders through
training, internships, scholarships and
exchanges.
- Strengthen the technical capability and institutional
capacity of Costa Rican conservation
organizations working in the Osa.
- Provide environmental education in local
schools.
- Create youth conservation organizations in the
Osa’s communities.
- Involve local businesses, such as ecolodges and
tour companies, directly in supporting conservation
activities in the Osa.
GOAL: $995,000
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A Cooperative Model for Conservation

The Osa Campaign is a public-private international
partnership of four institutions committed to a
common goal.
Conservation International (CI). Conservation
International is a U.S.-based, international nonprofit
organization. Its mission is to conserve the
Earth’s living natural heritage, our global biodiversity,
and to demonstrate that human societies are
able to live harmoniously with nature. CI applies
innovations in science, economics, policy and
community participation to protect the Earth’s
richest regions of plant and animal diversity in
the hotspots, major tropical wilderness areas and
key marine ecosystems.
Costa Rican Ministry of the Environment and
Energy (MINAE). Through its decentralized
National System of Conservation Areas, MINAE is
the governmental agency responsible for the management
of Costa Rica’s national parks and other
protected areas. In Osa, MINAE works through its
representatives in the Osa Conservation Area
(ACOSA). MINAE is also responsible for the implementation
and enforcement of many of the nation’s
environmental laws, including hunting and forestry
regulations, and evaluation of the environmental
impacts of new development.
Costa Rica—USA Foundation (CRUSA). CR-USA
was founded in 1996, by an agreement between the
governments of Costa Rica and the United States,
as a private, nonprofit foundation, to promote ties
between the two countries through support for sustainable
development in Costa Rica. Its bi-national
governing boards give priority to grant-making for
the environment, education, science and technology,
and competitive development. From its beginning,
CR-USA has supported conservation projects
and has made a $3 million challenge grant to the Osa Campaign.
The Nature Conservancy (TNC). The Nature Conservancy
is an international, nonprofit membership
organization founded in 1951. Its mission is to protect
the plants, animals, and natural communities that represent the diversity
of life on Earth by
protecting the lands and
waters they need to survive.
Working through
a network of partners
in 28 countries, the
Conservancy’s non-confrontational,
businesslike
approach has enabled it
to protect more than 117
million acres around the
world. The Nature Conservancy has a long history in
the Osa area and in 1975, helped create the 100,000-
acre Corcovado National Park.
Local Partners
The Local Commission of the Osa Biological Corridor,
composed of representatives of local communities
in the Corridor and many of the Osa’s grassroots
organizations, informs the Campaign and its other
partners as to the needs and ideas of the Corridor’s
residents. The Local Commission is therefore key to
developing highly responsive and effective conservation
programs based on good information, many
of which will be implemented by Commission
members themselves. Increasing the capacity of
the Commission and its members to develop and
implement projects is a very high priority for the
Campaign.
Since it began, the Campaign has worked closely
with an existing coalition of national and local
conservation organizations called the Technical
Coalition for the Osa Biological Corridor. Comprised
of five well-established Costa Rican conservation
groups working in the Osa, the Coalition represents
an outstanding technical resource to help plan and
implement Campaign objectives in the field. The
members of the Coalition have highly complementary
capabilities and have cooperated extensively
amongst themselves, with the Local Commission,
with ACOSA, and others in developing and implementing
conservation initiatives in the Osa. Indeed,
the Coalition was instrumental in creating the
Corridor’s Local Commission and has provided the
Commission with both financial and technical
support.
COVIRENAS. Costa Rica’s Wildlife Law, enacted in
1992, created a program called COVIRENAS (Natural
Resources Vigilance Committees). These volunteers
from local communities are trained to help park
staff and police protect the area’s ecosystems. There
are presently 65 such volunteers working in eight
communities in the Osa. They monitor and report
violations of hunting laws and also participate in
education and research activities in the Corridor.
Though small in scale, this voluntary program led
by community members is the type of approach
that can have a significant long-term impact.
COVIRENAS volunteers were instrumental players
in a campaign that significantly reduced logging in
the Osa between 1998 and 2002. Moreover, as an
organized and highly motivated and committed
group, COVIRENAS can assist conservation efforts
in a number of other ways, such as assisting scientists
in research and monitoring activities, ensuring
compliance of landowners with easements, and
organizing environmental awareness campaigns.
Residents of the Osa have also been recruited to
assist in the Campaign’s fundraising efforts. Many
lodge owners and local residents in the Osa have
joined together to form Women of the Osa, which is
committed to raising funds from visitors in support
of the Campaign. In the southern part of the Peninsula,
a group of landowners has formed Friends of
the Osa, an organization created to manage their
lands as a private wildlife refuge as well as help raise
funds for the Campaign.
Also, the Campaign has formed a National
Campaign Committee in Costa Rica comprised of
prominent local leaders in business, society and
civic organizations that gives a public face to the
Campaign in Costa Rica and is responsible for
raising a portion of the Campaign goal.
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How The Nature Conservancy Works in the Osa Peninsula
With the Costa Rican government and a strong network of partners, The Nature Conservancy is working to protect and maintain the Osa Peninsula's forests and coastal areas. We are doing this in a variety of ways, such as:
- Acquiring and protecting land
- Strengthening the management of protected areas
- Hiring and training park staff
- Creating a 100,000 acre biological corridor between Corcovado and Piedras Blancas National Parks
- Partnering in a campaign to raise $32.5 million towards conserving the Osa.
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