Here you will find our newest updated Checklist of Birds Readable Version and our Printable Booklet Version (1/2 Letter Booklet 5.5 x 8.5). The list is long as it includes not only the Osa Peninsula but all the ACOSA region including Bahia Ballena, Terraba-Sierpe, Golfito on down to Punta Burica.

Our list of birds comes from the Audubon Christmas Bird Count, our yearly Neotropical Migratory Birdathon, Community participative monitoring (Citizen Science), eBird, Surcos Tours, Bosque del Rio Tigre, and our own monitoring work over the course of 10 years. That said, we do have a few information gaps so please help us fill them in especially outside of the Osa Peninsula.

Please please enter your bird observations into eBird!

It helps us immensely, but more importantly, it bolsters the information we, as a global community, have for the conservation of all birds.

If you are interested in an eBird workshop, please contact us at and we will see what we can do!!

For changes or new observations to include in the list, please contact us at