a24f8ac4_uxent_Wildlife_Research_Center__Reference_on_Site
[Did You Know...] that the Breeding Bird Survey (BBS) Results and Analysis website is a source of information about distributions and population changes of North American birds? [Reference on Site] 
It is also a tool for learning about birds, with connections to the ID tips showing pictures of common North American birds and quizzes on bird distribution and identification. The primary objective of the BBS has been the estimation of population change for songbirds. However, the data have many potential uses, and investigators have used the data to address a variety of research and management objectives. More information...
Did you know? - Patuxent Wildlife Research Center
Reference on Site