A goldfish

These small fish are comprised of tiny calcium bones and cartilage, which work together to leverage and protect the animal.

A bat wing

A bat's wing is similar in structure to the human arm and hand, but they come with more than two dozen joints and a thin membrane surrounding them.

A baby turtle

A turtle's shell serves as armour and protects its body, but the reptile actually couldn't live without it--its ribs and backbones are fused to the bones in the actual shell, making them a two-for-one package, if you will.

The upper jaw of a horse

A horse spends between 15-18 hours a day chewing, so it makes sense that their jaws are comprised of teeth that grow 1/8 inch each year.

A pregnant dog

So. Many. Puppies. A dog averages roughly five pups per pregnancy (depending on the breed), which definitely has us feeling for this female dog and her very full uterus.

A dead mosquito

It may look like these pesky creatures have bones in this x-ray, but they're actually invertebrates, meaning they have exoskeletons instead.

A bullfrog

A short backbone and wide hip bones are what allows these creatures to hop as powerfully as they do. Now isn't this is way cooler than dissecting the creature biology class?

A grey squirrel

Given that these neighbourhood dwellers can jump roughly four feet high (and nine feet vertically), it's no wonder they have such sturdy leg and hip bones holding them up.

A shrimp

All shrimp are invertebrates (boneless), but that doesn't make their hard exoskeletons any less beautiful when pictured in x-ray form.

A green iguana

Inside these reptiles' tails are weakened vertebrae, which allow them to drop their tails (and sometimes regrow them) if they're ever threatened.

A wild duck

Like many other birds, ducks have a system of hollow bones that allows them to fly and swim with relative ease. Now isn't that just ducky.

A hedgehog

These small creatures boast a surprising number of bones, including longer hind and forelegs than most people probably realize.

A rabbit's head

That giant hole may look ominous, but it's actually quite purposeful: herbivores like rabbits have a space behind their front teeth (a diastema) where they gather plants before chewing them.

Viper Moray

These saltwater eels have two sets of jaws, the second of which is located in their "throat" region. That jaw is known as the gill arches, which help to support the gills -- the major respiratory organ of fish.