The Ostrich: The Biggest Bird—but Not in the Air If the competition were about size alone, the ostrich would take the crown as the world’s largest bird.

Scientists have celebrated a surprising discovery about pterosaurs - the largest flying animals to have ever lived. The ancient reptiles were once tiny tree-climbers but, over time, evolved to ...

Whales are a group of mammals that live in oceans. They include some of the largest animals on Earth. The blue whale is the ...