14,000 tons of sunscreen are discharged into coral reefs each year, and a drop of it contains enough oxybenzone to disrupt coral growth.

There's a species of fish called "slippery dick."

A duck's webbed feet have no nerves or blood vessels, rendering them incapable of feeling the cold.

A single gram of venom from the toxic frog species Aparasphenodon brunoi could kill 80 humans.

Pigeons can be trained to tell good art from bad art, according to a study.

A hummingbird takes up to 250 breaths in a minute.

Hummingbirds have no sense of smell and can't walk.

Female koalas have two vaginas.

For polar bears, a single mating session may last up to 65 minutes, with a male mating with the same female for as long as 10 days.

Female koalas have two vaginas.

Black widow males destroy their mates' webs in order to ward off potential rivals, since the webs are coated with the females' pheromones.

An electric eel will short-circuit itself if put into salt water.

When wounded, an electric eel can accidentally shock itself—an eel's thick skin is what normally insulates it from its own attacks.

Weasels have been known to kill prey up to 10 times their size.

Dogs have faithfully lived with humans for over 14,000 years.

A hummingbird weighs less than a penny.

True - see here

36 million years ago, penguins were about 5 feet tall.

True - see here

A saber-toothed tiger's jaws were capable of opening at an astounding 120-degree angle, while a modern lion’s jaws max out at 60 degrees.

An octopus's testicles are located in its head.

Difference between hippo and zippo. One is really heavy and one is a little lighter