Puede que nunca hayas visto un cardenal norteño en la naturaleza, pero probablemente lo has visto en tarjetas navideñas o en la portada de algún libro de aves. Durante la temporada de reproducción en primavera, el biólogo Eric Lind y su equipo capturan y anillan aves en Constitution Marsh…

The White-crowned Sparrow pours out its song over and over on spring and summer days-and even on moonlit nights-often up to 15 times a minute. Now here's a curious thing: Just as people in different regions may have different dialects, White-crowns have different songs, according to where…

Here they come! Rufous Hummingbirds, Black-chins, Broad-bills, Ruby-throats, and others are migrating north after a hot, dry winter in sunny Mexico or Central America. And they’re ready for a drink. You can help these thirsty birds by hanging a hummingbird feeder filled with the right kind…

When smaller birds join forces to ward off larger birds, it's called mobbing. This behavior — like calling your family for help — is used by many bird species. The best time to observe mobbing is spring and early summer, when breeding birds are trying to protect their nests and young…

The Northern Shrike breeds in the tundra and taiga of the north, but migrates south into the lower 48 for the winter. It has a pleasing and rhythmical song, which it sings even in winter. But its song belies a rather bloodthirsty feeding habit. The shrike impales its prey on sharp thorns…

Once nesting season ends, swallows know it's time to party! Whether they nest as single pairs or in large colonies, both adults and juveniles now gather on electrical wires by the dozens, socializing before they migrate. Migrating by day – and foraging for insects as they go – swallows…

After young birds have left the nest and can fly short distances, they still follow their parents and beg for food. They squawk and assume a begging posture, wings drooping and head hunched down. Most young birds, including this Crow, depend on their parents for days, weeks, or even months…

Waterfowl like this Muscovy duckling spend up to 30 days in the egg, so they’re able to walk, swim, and feed themselves as soon as they hatch. We call these chicks precocial. By contrast, the chicks of most songbirds spend less time maturing in the egg. They must continue to develop in the…

The Belted Kingfisher dashes through the air, warning intruders with its rapid-fire, rattling call. In spring, the best places to see Belted Kingfishers are along sandy banks -- they are busy digging burrows, where they will nest. The holes typically reach three to six feet into the bank…

It's spring! And for many birds, a time to look their best to attract a new mate. This American Goldfinch has recently molted. Its old, worn-down feathers have fallen out, and new ones have grown in. When goldfinches molt in the fall, they lose these brightly colored feathers. Their winter…