Bird migration revealed by aerial photos and radar data
A profile of the researchers and technologies turning one of nature's most invisible phenomena into a map that conservationists can actually read and act on.
Before Dawn, the Sky Fills Every spring, roughly 4 billion birds push north across North America most of them moving at night, invisible to the naked eye, guided by stars and magnetic fields. For most of human history, this mass movement was something we could only infer from the sudden appearance of warblers in a backyard oak. Now, researchers and conservationists are turning that invisibility into something you can actually read, interpret, and act on. The tools have changed dramatically. What once required...
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