A World on the Wing: The Global Odyssey of Migratory Birds–A Book Review
10,000 Birds
APRIL 6, 2021
Great Frigatebirds engage in “unihemispheric sleep” on hunting trips of six to ten days, never landing, sleeping less than an hour in a 24-hour cycle, often keeping one-half of their brain awake while the other slept. It is early April as I write this, and migration is beginning to trickle through to New York City.
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