Who We Are

Photograph by: Catalina Mora

Where We Work -The Osa Peninsula

Photograph by: Alan Dahl


Photograph by: Manuel Sanchez

World Migratory Bird Festival

Photograph by: Minor Hidalgo


Conserving Birds And Their Habitats On The Osa Peninsula Through Research And Education

Who We Are

Osa Birds is a charitable non-profit organization dedicated to conserving birds and their habitats on the Osa Peninsula and the southern Pacific coastal slope of Costa Rica through innovative science, education, conservation initiatives and key partnerships that will facilitate species protection.


Osa Birds monitors bird population tendencies to detect possible species declines over time.  We collaborate with public agencies,  non-governmental organizations working to achieve similar objectives, and interested parties to develop conservation management strategies for species protection over the long term.


This is where Education lives, within the communities of the Osa, and it is woven into everything we do!  Osa Birds works to raise awareness of bird conservation and habitat protection within the local rural schools and communities.  Activities include…

Taxonomic Changes 2019

The new common and or scientific names are highlighted in Bold below for birds found either on the Osa Peninsula or in the southern Pacific region of Costa Rica. For other taxonomic order changes or merges/splits, please refer to the American Ornithological Society (AOS) checklist of North and Middle American birds currently in its 7th edition and its supplements.

Checklist of Birds

Here you will find the newest updated Checklist of Birds for the Osa Conservation Area (ACOSA). The list is long this year as it includes not only the Osa Peninsula but all the ACOSA region including Bahia Ballena, Terraba-Sierpe, Golfito down to Punta Burica.

Protect Birds: Be the Solution to Plastic Pollution

The accumulation of plastic is a worldwide epidemic affecting our terrestrial and marine ecosystems; everywhere humans tread. It is one of the principal threats to birds posing serious health risks and endangerment. At least 8 million tons of plastic waste flows into our oceans and water bodies every year!

Osa Birds Gallery


News and Updates

Taxonomic Changes to Birds 2019

Ver la Traducción al Español Abajo. The new common and or scientific names are highlighted in Bold below for birds found either on the Osa Peninsula or in the southern Pacific region of Costa Rica.  For other taxonomic order changes or merges/splits, please refer to...

Featured Bird: Chestnut-sided Warbler

See English Below Simplemente porque es de la famila Parulidae, la familia con más representantes de aves migratorias en la Península de Osa, les traigo la Reinita de costados castaños (Setophaga pensylvanica), la reinita y ave migratoria más común en Osa.  De solo 10...

Reforesting Riparian Areas

Today the Biological Monitoring Group of Rancho Quemado and the Junior Park Guards gathered to restore a degraded watershed along the Riyito River at the bridge entrance to Rancho Quemado.  Plants such as Heliconias, Episcias lilacinas, Calateas, Rubeaseas, Estococas...

Recuperando el bosque en el corazón de Osa

En el proyecto “Estrategias de conservación de bosques y fortalecimiento de emprendimientos verdes en la comunidad de Rancho Quemado, en el área de amortiguamiento del Parque Nacional Corcovado”, actualmente ejecutado por Aves de Osa y financiado por el Canje I de...

2019 International Migratory Bird Day Festival

At Osa Birds fifth-annual International Migratory Bird Day Festival, children danced in the streets dressed as flamboyant, richly colored birds, holding feathered wings aloft.  An integral piece that gives flight to this event is the Tropical Wings annual Birdathon,...