While there are over 11,000 bird species in the world, only a select few grow to large sizes. Birds are measured by weight ...

The fossilized leg bone of the terror bird went unidentified for almost 20 years. Nearly 12 million years ago, the largest ...

This owl ranks among the largest and most powerful in the world and is the only known species to have ever killed a human. Adapted to hunt in dense forest habitats, this bird of prey is ...