Add Yahoo as a preferred source to see more of our stories on Google. Hummingbirds have one of the highest metabolic rates of any vertebrate. They are the only birds capable of sustained backward ...

Hummingbirds fly so quickly (and beat their wings so fast) that they need an exceptionally efficient supply of oxygen-rich blood to keep them going. But don't go thinking that such a high heart rate ...

With the work it takes to raise a hummingbird family, females are typically scarce through the summer. But now, they're starting to appear.

Everyone loves to watch hummingbirds—tiny, brightly colored blurs that dart about, hovering at flowers and pugnaciously defending their ownership of a feeder. But to the scientists who study them, ...