When we think of large birds, we might picture swans, ostriches, or eagles. But which bird is the biggest? Well, it depends ...

Sixty-six million years ago, at the end of the Cretaceous Period, an asteroid impact near the Yucat n Peninsula of Mexico triggered the extinction of all known non-bird dinosaurs. But for the early ...

The iconic monarch butterfly is declining across North America. You can help make a difference by providing the species with ...