Anatomy Facts

Some turtles can breathe through their butts.

A crocodile cannot stick out its tongue.

Artists have long used a simple rule: your head is approximately one-eighth of your total height. This classical proportion has been used since ancient Greece to draw the ideal human figure.

It is impossible to hum if your nose is plugged.

Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.

An alligator can go through 2,000 to 3,000 teeth in a lifetime.

A 4-foot walrus penis bone sold at auction in 2007 for $8,000.

Most people cannot lick their own elbow due to the length of the human arm and the limited range of motion in the shoulder and elbow joints.

Like fingerprints, everyone's tongue print is different.

The cat brain weighs about 30g.

Your stomach produces a new layer of mucus every few days to protect itself from being digested by its own acid.

Most birds tilt their heads back when drinking water to let gravity help the liquid flow down their throat, but they swallow food using muscular contractions called peristalsis—the same mechanism humans use.

The katydid bug hears through small oval openings in its front legs!

Your heart will pump about 212 million liters in its lifetime.

The adult human brain weighs about 3 pounds (1,300-1,400 g).

Your skin is actually an organ.

The smallest medically recognized penis size is called micropenis - defined as less than 2.75 inches when stretched in adults, affecting about 1.5 in every 10,000 male newborns.

Mel Gibson has a horseshoe kidney (two kidneys fused into one)!

On average, there's 100 billion neurons in the human brain.

Your skeleton keeps growing until you are about 35, then you start to shrink.

You mostly breathe from only one nostril at a time!

Babies are born without knee caps.

Like fingerprints, everyone's tongue print is different!

Your ribs move about 8 million times a year, every time you breathe!