It’s about 3 inches long and weighs as much as a penny. But a calliope hummingbird is a tough little bird. It can fly up to 5,600 miles in a year. Despite its tiny stature, the smallest bird native to ...

Scientists once believed birds relied only on flight, talons and socialization for survival. But this one proves otherwise: it uses chemistry. For most of modern biology, there was a widely accepted ...