Meanwhile, some birds' bodies change when they evolve semi-aquatic lifestyles. Penguins, for instance, can't fly, but they swim in a way that's akin to "flying underwater." ...

The more energy the birds use while flying, the more carbon 13 they expel, in the form of carbon dioxide. Less then remains in their bodies and breath when they are removed from the wind tunnel.

For example, let’s compare two types of birds: the sparrow and the albatross. Jonathan Rader: These two birds have completely different lifestyles, and they fly in very different ways.

More than 99% of birds can fly. But that still leaves many species that evolved to be flightless, including penguins, ostriches, and kiwi birds. In a new study in the journal Evolution ...

And while I make fun of how quail fly, they are one of my favorite birds. Soon, the parent birds will be bringing the walnut-sized chicks to our ground saucer for water.

While the nocturnal avian visitors are seldom seen, they can often be heard. “All the bird sound in the morning is kind of this epic layering of different species,” Yoerger said.

NASHVILLE, Tenn. (WKRN) — Tennessee is in the peak of bird migration, according to experts. In fact, the current weather conditions are causing the number of birds flying north to explode. Laura ...