Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. Most birds fly at low altitudes, relatively speaking. But ...
The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.
Migratory birds change how high they fly over deserts and seas. Wing shape, feather color, and heat all play a role in helping them survive.
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