Birds that dive underwater — such as penguins, loons and grebes — may be more likely to go extinct than their nondiving kin, a new study finds. Many water birds have evolved highly specialized bodies ...

Anna's hummingbirds can reach top diving speeds of around 60 mph, but their normal flight speed is around 25-30 mph. During flight, the little birds can reach nearly 10 g's of force. When diving, ...