Tropical birds called barbets sometimes make their homes in the termite holes of rotting trees. This must be one happy home!
Photograph by Getty Images
Marbled tree frogs sport a pattern of spots on their bellies. Maybe this guy loves looking fabulous.
Photograph by Pete Oxford, Getty Images
African elephant calves have been spotted chasing birds just for fun.
Photograph by Anup Shah, Corbis
Hello there! Elk make a low-pitched bellow known as a bugle to attract a mate.
Photograph by Anna Stevenson, Alamy Stock Photo
Dogs have been bred to help people hunt, herd animals, and retrieve things. So playing fetch is part of their natural behavior—and these guys seem to enjoy it.
Photograph by DLILLC, Corbis
This hippopotamus calf is happy near its mother. But don’t get too close! Most hippo attacks occur when a mom is protecting her baby.
Photograph by Villiers Steyn, Getty Images
A sheep often follows the one in front of it. Maybe these two cuties will also jump for joy like their leader!
Photograph by Jerome Murray - CC / Alamy Stock Photo
Why do these camels look so happy? Maybe they’re enjoying each other’s company. Camels live in small family groups of about six animals.
Photograph by John Lund, Stephanie Roeser, Getty Images
Chimpanzees tickle, chase, and wrestle with each other—and they laugh while they’re doing it!
Photograph by ZSSD, Minden Pictures
Say cheese! Tigers have the longest canines of any big cat—about four inches.
Photograph by Cliff Philipiah, Getty Images
Click the full-screen arrows in the upper right to read the captions!