Delaware-Otsego Audubon Society (DOAS)

Established in 1968 – A Chapter of the National Audubon Society since 1970

Breeding Bird Atlas 2020

American Robins – Nesting; Image by Mick Thompson;

For those of you who are new to the NY Breeding Bird Atlas and would like to learn more, here’s a great explanation from Andy Mason:

The Breeding Bird Atlas is a 5 year project carried out every 20 years, with the goal of documenting the geographic distribution of breeding
birds in the state. The first one was 1980-85, so this is the third, and NY is the first state doing a third atlas. It officially kicked off on Jan. 1.

The field work is carried out almost entirely by volunteer birders, such as us, who survey defined blocks to find various levels of evidence of breeding–from just hearing a bird singing to finding a nest with eggs or young. In between is other evidence of breeding such as a pair
observed, a bird carrying nesting material, or a bird carrying food for young, etc. Each of these has an evidence code that is recorded when observed.

Since this is a breeding bird survey, most of the work takes place in May, June or July, although evidence of breeding by owls and a few other birds can be found as early as January.

This Atlas III is quite a bit different from the previous two. The blocks are a different size, the data will be entered using eBird, Cornell’s online database, and there are identified priority blocks where field workers are asked to concentrate before moving on to non-priority blocks.

My understanding is that signing up for a block indicates a commitment to give that block adequate coverage over the length of the project. However, others can enter data for that block, and data can also be entered for non-priority blocks at any time.

The web site,, has a lot more information.

Share this Page

Why Birds Matter...


DOAS Big Day Recap

From Coordinator, Charlie Scheim, To all Big Day participants… I want to thank you all for devoting your time on Saturday to our Big Day count. I hope you all

Read More »
We envision a healthy world where people and wildlife thrive and natural resources are protected.
The mission of Delaware-Otsego Audubon Society is to protect our natural environment and connect people with nature
 to benefit birds and other wildlife through conservation, education, research and advocacy.

Delaware-Otsego Audubon Society
P.O. Box 544
Oneonta, NY 13820
(607) 397-3815

© 1968-2022 Delaware-Otsego Audubon Society

Images and drawings on this site are used with permission of the artists and are subject to copyright.