Dolphin returns to the ocean with a helping hand from humans

Beavers: 8 things to know about nature's most impressive landscape engineers

Beautiful sea slugs are surprising tide pool treasures

What do you know about flamingos?

2,000 NYC pigeons to perform in spellbinding aerial light show

Mysterious glowing jellyfish discovered near Mariana Trench

Hollywood chimp retires to Florida after 16 years in captivity

Ever wonder how European starlings came to the U.S.? Blame Shakespeare

Key and Peele's shelter cat promo for 'Keanu' is brilliant

Shinda the gorilla surprises with 'miracle' baby

5 facts about the incredible (and huge) Atlas moth

Sheepdog runs home — a 240-mile, 12-day trek!