After an emperor penguin hatches from its egg, its mom takes off and leaves dad in charge of babysitting. Why? She travels up to 50 miles away to the ocean to dive for fish, squid, and krill. When she returns to her chick, she regurgitates all this food into its mouth. Yuck for us humans, yum for a little penguin. (Don’t miss these arrestingly beautiful photos that stand the test of time.)
Michael Nichols/National Geographic Creative
At birth, newborn panda cubs are 1/900th the size of their mothers. Their average weight is a measly one-fifth of a pound, which makes them one of the smallest newborns relative to their mother. But they get big and strong very fast: By age one, pandas weigh 88 pounds. These exceptionally rare National Geographic photos will stay with you.