Go on. Look inside.

The shrike looks like a harmless little grey songbird, but its feet are too weak to hold prey.

The tongue-eating louse is a tiny ocean parasite that slips into a fish through its gills and clamps onto the tongue.

Cats can't taste sweetness.

The Fitzroy River turtle in Australia pumps water in and out of its rear end.

When a giraffe drinks, its head drops from about two metres above its heart to below it.

Hippos sometimes look like they are covered in blood, but the red stuff is not blood and not sweat.

Chocolate contains theobromine, a chemical closely related to caffeine.

A cat's tongue is covered in hundreds of stiff, backward-curving spines made of keratin, and each one has a hollow scoop at the tip.

Fulmar chicks spend a lot of time alone on cliff ledges while their parents feed at sea.

Glass frogs have see-through skin, but red blood should give them away.

Scratch the right spot and your dog's back leg starts pedalling.

The southern gastric-brooding frog swallowed her own eggs, switched off her stomach acid, and raised her young inside her stomach for about six weeks.

Some farmers give their cows a magnet to swallow on purpose.

Wombats are the only animals known to make cube-shaped poop.

Eucalyptus leaves are tough and toxic to most animals, and a baby koala that has only drunk milk can't digest them.

Scare a myotonic goat and it tips over like a statue.

When a cat sniffs catnip, a chemical called nepetalactone reaches scent sensors in its nose, and its brain releases feel-good chemicals.