What do estimates of bird populations tell us about these species?

How many birds are there, anyway?
If you wonder about the number of birds of a given species, you can access some remarkable current data here. It’s a joint effort between Partners in Flight and the Bird Conservancy of the Rockies.
You’ll learn that the American robin is apparently by far the most common bird in the United States and Canada, with an estimate of 370 million, followed in second place by the blue-gray gnatcatcher and chipping sparrow, both at 230 million.

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