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…

Great Blue Herons nest in colonies, in adjoining trees or with several nests in one tree. But by autumn, the adults and gangly young have left the nests to take up solitary lives, a pattern that is the reverse of many other species. After all the "togetherness" of the nesting colonies, the…

The Canyon Wren makes its home on the steep rocky outcrops and vertical stone cliffs of the coulees and mesas of the West. The birds are found from Mexico all the way through southern British Columbia. They live among the rocks all year long, nesting in rock piles and beneath overhangs…

A close look at this Red Crossbill reveals a curious adaptation. The long tips of the upper and lower bill don't meet, but instead cross over each other. The Red Crossbill bites between the scales of a cone and pries them apart by opening its bill, then dislodges the seed with its tongue…

Have you ever watched ducks walking around in freezing temperatures and wondered why their feet don't freeze? And how do birds, including this Northern Flicker, sit on metal perches with no problem? Birds' feet have a miraculous adaptation that keeps them from freezing. Rete mirabile —…

You may see Dark-eyed Juncos in the summer, but come fall, many more — those that have been nesting in the mountains or farther north — arrive to spend the winter. These juncos often visit birdfeeders for winter feasting. Dark-eyed Juncos forage on the ground. The flash of white tail…

Is that big black bird a crow or a raven? How can you tell? Ravens (seen right here) often travel in pairs, while crows (left) are seen in larger groups. Also, study the tail as the bird flies overhead. A crow's tail is shaped like a fan, while the raven's tail appears wedge-shaped or…

The Green Heron forages on the banks of small bodies of fresh water. Relying on its plumage for camouflage, it perches motionless — body horizontal and stretched forward — waiting for small fish to come close. This heron may use "bait" while hunting for fish. It drops a feather, a live…

By late summer, the male Mallard’s need for fancy feathers to attract the females has passed. These birds have molted, and their bright feathers are replaced with mottled brown ones. Subdued colors help camouflage the male ducks, protecting them from predators. Come fall, the male Mallards…

Bar-headed Geese, champions of high-altitude migration, leave their nesting grounds in Tibet and scale the Himalayan range on their way to wintering grounds in the lowlands of India. How do they do it? These geese have a breathing structure that extracts oxygen from thin air, even at 30…