One eye on watch
The Dolphin's Half-Awake Sleep
A dolphin sleeps with only half of its brain at a time, keeping one eye open to watch for danger.
Diet
Meat eater wonders
Eats other animals.
Story
Quiet flyer
Owl's Silent Wings
An owl can swoop onto a mouse in almost total darkness without making a single sound, thanks to wings built for silent flight.
Story
Floating together
Otters Holding Hands
Sea otters often hold paws while they sleep, so ocean currents don't drift them apart from each other.
Story
Extra beats
Three Hearts, One Octopus
An octopus has three hearts, and one of them stops beating every time it swims.
Hidden warmth
The Bear's Black Skin
Under all that white fur, a polar bear's skin is actually jet black.
Story
A pouch of his own
The Seahorse Dad's Surprise
A daddy seahorse carries the eggs in a pouch on his belly and gives birth to the babies himself.
Story
Backward grower
The Time-Traveling Jelly
One tiny jellyfish can grow younger instead of older when life gets hard, essentially reversing its own aging.
Story
Tiny builders
The Coral City
A giant coral reef is built slowly over hundreds of years by animals smaller than your fingertip.