Mexico's Bumblebee Hummingbird is one of the smallest birds in the world. Less than 3 inches in size and weighing less than a bottlecap, they’re easily confused with a bumblebee as they buzz by. But as tiny as they are, they defend their breeding territories fiercely. Perhaps that’s why the ancient Mexicas associated hummingbirds with their most important god: Huitzilopochtli, the god of war…and of love. Huitzil means hummingbird in Náhuatl.

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To find out if a crow can recognize an individual human face, Professor John Marzluff of the University of Washington wore a mask while trapping, banding, and then releasing seven American Crows on campus. Later, when he walked through the campus wearing the mask, it was automatic! A big group of birds scolded and divebombed him. He thinks it's a benefit to the birds' survival to point out and recognize challenges in their environment. Watch a video and learn more at ScienceMag.org.

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A blip on weather radar might not be a cloud — it could be thousands of birds! Biologists use radar to keep track of migratory birds, insects, and bats. An online resource called BirdCast combines decades of biological research, citizen science observations, and radar data to forecast the movements of migratory birds. You can use these predictions to help plan a birding trip.

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Hooded Mergansers, affectionately known as “Hoodies,” nest across most of the northern US and well into Canada. They’re especially prevalent around the Great Lakes, though some winter as far south as Florida. By November, courtship and pair formation is well under way. And by early spring, Hoodies will seek out secluded woodland ponds, where they nest in tree cavities or manmade nestboxes. Hooded Merganser eggs are nearly spherical, with surprisingly thick shells. They’re ideally suited to the Hooded Merganser’s nest of choice — a cavity or a hole.

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In this episode, ornithologist J. Drew Lanham reads a letter he has written to a wood-pewee, a flycatcher with an “understatedly simple and definitive” song that says the bird’s name.

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After hawks and eagles, some of the sharpest eyes belong to hawk-watchers, experienced spotters who count raptors during spring and fall migration. Groups like HawkWatch International organize census counts of hawks (like this Red-tailed Hawk) and other raptors. HawkWatch sites lie along primary migration routes like mountain ridges and coastlines, where updrafts of rising air funnel the birds’ north-south movement. Different species peak at slightly different times.

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The song of the Black-capped Chickadee pretty much the same throughout the U.S. and Canada — with just a few exceptions, like on some Massachusetts islands. Chickadees on Martha’s Vineyard and tiny Tuckernuck Island nearby have developed songs entirely their own. It’s likely that the birds’ isolation from mainland birds led them to develop unique behaviors.

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Monk Parakeets, also known as Argentine Parrots, are native to South America but have become popular as pets – thanks in part to their intelligence and ability to mimic human speech. But in some areas, such as Mexico, these birds have become invasive. After being released or escaping, some Monk Parakeets have formed feral populations that have quickly spread, competing with native bird species for resources.

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Millicent Ficken spent her career studying bird behavior and communication. The first woman to earn a PhD in Ecology and Evolutionary Biology from Cornell in 1960, Ficken authored over 100 scientific papers. She discovered that male hummingbirds have a whole repertoire of songs rather than just one, outlined the linguistic differences between penguin species, and showed that chickadees take turns singing in the morning. She was especially fascinated by how birds play, showing that bird play almost always has a pressing purpose — they're practicing a skill they need to survive.

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Chickadees and titmice, nuthatches and jays, and woodpeckers, like the Pileated pictured here, all love suet. As do birds whose beaks can’t open seeds, like tiny kinglets, and almost any wintering warbler. The Brown Creeper, usually creeping up tree trunks, is a cool bird to discover at your suet feeder. And in the West, look for mobs of tiny Bushtits, taking a break from their normal diet of insects and spiders.

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