The Best Father's Day in D.C. (We Ain't Lion)

This year was filled with incredible and heartwarming stories about the animals and the people who care for them. Enjoy a look back at some of the amazing things that happened this year.

Reaching up to 10 feet (3 meters) long, arapaima are the largest freshwater fish in South America. Learn what else makes these animals unique.

This summer has been eventful for our youngest western lowland gorilla, Zahra, who will be 16 months old on Sept. 27. Read primate keeper Francesca Bozzo's update!