Learn what a Calliope hummingbird looks like, where to find these tiny birds in the U.S., and how to attract them.

Weebill, with short, stubby, and pale beak, is one of world's smallest birds. It can grow up to 8-9 cm long and weighs around 6 grams ...

The smallest bird in the grouse family, the white-tailed ptarmigan is also one of the few animals that lives on alpine mountaintops throughout its entire life. Every part of this ptarmigan is adapted ...