BirdNote Daily

In temperate climates like North America, it’s often male songbirds that sing the most. Typically the males migrate north before females and establish territories for the short breeding season, using their songs as a way to claim a spot. But many female birds do sing, even in colder climates (like this Bay Wren). And in warm tropic zones, female birds often have a big role in defending a territory, and many of them sing just as loudly and artfully as the males.

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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.

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We've all heard that the early bird gets the worm. But research shows that birds dining early and heavily may lower their life expectancy. Socially dominant birds stay lean (and agile at avoiding predators) during the day, and then stoke up later, before a cold night. Subordinate birds have to look for food whenever and wherever they can find it, and carry fat on their bodies to hedge against unpredictable rations.

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Urban ornithologist and children’s author Murry Burgess has always been interested in wildlife. But she first felt a spark for birds on a college field trip to Dauphin Island, a beach town on the Gulf Coast of Alabama that’s a famous stop-over site for migratory birds. There, she saw a dazzling male Painted Bunting that amazed her both with his colorful plumage and incredible migration journey. Now Murry is a professor researching how urban environments impact birds, a children’s book author, and co-founder of the nonprofit Field Inclusive, which advocates for safety and diversity in the outdoors.

This is Field Inclusive Week, an annual week of connection, learning, and empowerment for all field biologists and outdoor enthusiasts! This year’s virtual events build on a legacy of diversity, inclusion, and field safety. Learn how you can participate at fieldinclusive.org.

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Western Tanagers dart from tree to tree, on the lookout for delicious bugs. They’ll find them by scanning the tree bark — or maybe snatching them from mid-air during flight — a tactic called hawking. Come winter, these lovely songbirds head south, where they fit right in with the other brightly colored tropical birds they’ll spend the winter with in Mexico and Central America.

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Ornate Hawk-Eagles stand out from other raptors with their impressive crest that looks like an elegant crown in adults, and a punk hairdo over the white-headed and black-bodied juveniles. These birds are excellent hunters, but they’re also devoted parents.

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