Before the high-tech gadgets used to track bird migration today, there was moon-watching: a technique dreamed up in the 1940s by ornithologist George Lowery. Using telescopes pointed at the moon to see the silhouettes of migratory birds, Lowery helped show that birds regularly migrate…

By late summer, most birds hatched in spring are on their own, without help from their parents. Where do they go? Young migratory birds will head south in late summer or fall, in the pattern of their species. But most non-migratory birds born last spring — such as this immature Bewick’s…

It’s been said that if someone knows only three birds, one of them will be the crow. They’re common, easy to see, and even easier to hear. But crow voices are complicated. Altogether, crows may use 30 sound elements in different combinations, and one of the most intriguing is their song…

Sometimes, a species’ song changes over the course of a few decades. But a bird that lives in the mountains of eastern Africa, the Forest Double-collared Sunbird, appears to have kept the same song for at least 500,000 years. That’s the amount of time that two populations of the species…

The four species of South American bellbirds can make a real racket, including this Bearded Bellbird. Hidden in the tree canopy, males cannot see one another as they sing — but they sure can hear each other! Their ear-splitting songs carry over long distances. The loudest of the species is…

Male Northern Cardinals, Scarlet Tanagers, and House Finches all have striking red plumage that’s thought to play a role in attracting mates. Males with the brightest red feathering tend to have the best luck with the females. Scientists think that a male’s redness signals to females that…

By August, most birds in North America have finished nesting, bringing billions of new birds into the world. So many birds. It might make you wonder: what is the most abundant bird in North America?

In the blue skies over the Andes Mountains, Andean Condors look majestic, with a ten-foot wingspan. While flying, according to researchers from Argentina and the UK, Andean Condors only flap one percent of the time. One bird was tracked for more than 100 miles over five flapless hours.

During the breeding season, when Eastern Screech-Owls capture the worm-like reptiles known as blind snakes, they deliver them to their chicks alive and wriggling. Some are gulped down immediately, but others escape by burrowing beneath the nest. The surviving “snakes” feed on the insect…

An unusual flycatcher called the Great Kiskadee takes on much bigger opponents, sometimes even riding on the back of a falcon for a few seconds to drive them off. Chunky and robin-sized, kiskadees live along wooded edges near water all the way from South Texas to Argentina. They’re a…