As more and more "historical" checklists are added to the platform, birds we've lost now mingle with those still hanging on.

In a darkened forest of central Colombia, a 2-foot-long mammal climbed a tree and paused to rest its “completely spiny” body.

"Poppy the Prairie Dog is an irresistibly cute and playful prairie dog who loves to explore and share her adorable antics. She'll warm your heart with her daily adventures, from fun playtime to ...