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The Largest Flying Bird Varies by Wingspan, Height and Weight
Flightless species of birds (such as ostriches, which are the largest living birds) tend to outsize any of the largest birds ...
National Audubon Society8h
Where Have All The Birds Gone?
Q: The amount of effort that goes into a Christmas Bird Count varies quite a bit across years and count circles. How do you deal with this issue when you calculate abundance trends? How do you know ...