BirdNote Daily

It might sound strange, but dirt helps birds scrub themselves clean. Birds of all sizes, like the Eurasian Skylark, often scrape a depression in the ground and flick dirt onto their bodies, shimmying to shake it off. Experiments showed that birds use dust to prevent oils from building up on their feathers and to remove dandruff — much like humans using shampoo in the shower!
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Every summer, millions of birds flock to the Arctic Circle to find mates and raise their young. In a study published in 2025, paleontologists found evidence of the earliest known Arctic breeding colony from fossils uncovered in northern Alaska. The site dates back nearly 73 million years when many prehistoric predecessors to modern birds still had teeth; including the gull-like ichthyornitheans and the flightless, loon-like hesperornitheans. These were among several types of ancient avians preserved as both adults and hatchlings, which suggests the site was used for nesting. Just like today, these birds were likely taking advantage of the abundant food provided by the 24-hours of summer daylight.
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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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