If you've never seen a Purple Frog before, that's in part because the amphibian does everything underground—except breed. For the first time, the mating of the Purple Frog has been captured on film, and, well, it's a bit tricky for the frogs.
When a crew of engineers stumbled across this critter while building a dam in the Amazon, many dubbed it the "penis snake," and it's easy to see why. But this phallic squirmer isn't a snake at all but an extremely rare, limbless amphibian.
The predator-prey relationship between frogs and beetles seems like it would be pretty obvious doesn't it? Frog spots beetle, frog stealthily approaches beetle, frog eats beetle. Done, done and done.
Darwin's frog, found in the forest streams of Argentina and Chile, has quite possibly the weirdest birthing method of any creature. Instead of hanging out in ponds, these little tadpoles help give new meaning to fathers with big fat mouths.
The 2.5-foot-long hellbender (a.k.a. "the snot otter" a.k.a. "the devil dog" a.k.a. North America's largest salamander) once populated the waterways all over the northeastern United States. Now, its population has declined such that scientists are cryopreserving its spiral-shaped sperm.
The Spanish ribbed newt has an unusual method of protecting itself: when presented with an attacker, the newt can pierce its own skin with its rib bones, allowing it to stab a predator and deliver a dose of deadly poison.