While its name comes from the French word bas, which means "low thing," this basset hound looks like he’s in high spirits.
Photograph by Ksenia Raykova, Shutterstock
What are these two hee-hawing about? Donkeys are naturally social creatures that form close bonds with other animals—especially other donkeys.
Photograph by Blue Iris, Shutterstock
Who knew moles could look this happy? Found throughout Northern Europe, European moles like this one have long claws they use for digging.
Photograph by Santia, Shutterstock
Smile? Nope. This panther chameleon is actually trying to scare away other chameleons by opening its mouth wide and rocking back and forth.
Photograph by Jim Zuckerman, Alamy
Many marine mammals, including this happy-looking gray seal, have a thick layer of fat called blubber that helps keep them warm.
Photograph by Bernard Castelein, Nature Picture Library
Ostriches swallow whole pebbles to grind food in their stomachs. They can carry about 2.2 pounds (1 kg) of stones at a time.
Photograph by Jonald John Morales, Dreamstime
Aw! Polar bear cubs stick close to their mothers for about two years, learning how to survive in their icy Arctic habitat.
Photograph by Tom linster, Shutterstock
While floating on their backs, sea otters like this one use rocks to help break open mussels or other shellfish to get to the tasty meat inside. Yum!
Photograph by Design Pics Inc, Alamy
No feathers ruffled here! Snowy owls like this one live mostly in open, treeless areas called tundra in the Arctic.
Photograph by James Pintar, Shutterstock
This stingray's mouth is on the underside of its body, along with its nostrils and gill slits. Its eyes are on the topside.
Photograph by Gaertner, Alamy
Click the full-screen arrows in the upper right to read the captions!