The Philadelphia Zoo’s “oldest and most famous residents” became first-time parents in April. And their family continues to grow. A zoo press release sent via email proudly announced that three more ...

Big Bear bald eagles Jackie and Shadow have welcomed two hatchlings! Thousands of eager viewers who have been watching the eagles' nest via webcam since the first pip showed over the weekend got to ...

Hatchlings were trained to associate a food reward with a specific pattern such as a bullseye at the end of a Y-maze. In the reversal phase, the reward was switched to a different pattern, requiring ...