BirdNote Daily

If a bird’s feathers get too dried out, they become brittle. To prevent that from happening, most birds have a gland located above the base of the tail that produces oil. They use their beaks to massage oil from the gland into their feathers to keep them supple. A bird first grips a feather in its beak near the feather’s base. Then it slides its beak along the length of the feather toward the tip. This action smoothes together the tiny structures — called barbules — that make up the feather, while also removing dirt and small parasites.
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Birds’ four-chambered hearts run larger than those of mammals, relative to body size, and they are coupled with extremely efficient cardiovascular systems. The energy demands of flight require these adaptations. An exercising human has a heart rate around 150 beats per minute. In contrast, an active hummingbird’s heart pumps at 1,200 beats per minute; a flying pigeon’s heart beats at 600.
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Magnificent Frigatebirds are huge, gangly seabirds found around the warm waters of the Western Hemisphere. When it comes time to mate, males inflate giant red throat sacs, then rattle and drum their bills against them to create jazzy percussive sounds.
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Sporting a fancy tuft of feathers on its forehead and a bright orange nape, Maui island’s ‘ākohekohe is one Hawaiʻi’s strikingly beautiful native forest birds. ‘ākohekohe are also critically endangered. Habitat loss and disease from invasive mosquitoes are major threats to their survival.
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In this episode, ornithologist J. Drew Lanham reads a letter he has written to a Pileated Woodpecker, a large species of woodpecker that is sometimes mistaken for the Ivory-billed Woodpecker.
More info and transcript at BirdNote.org.
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