Wombat poop is cube-shaped. Wombats “produce” 80-100 cubes per day, and carefully place them on rocks, logs, and in front of burrows to mark their territory. The unique shape prevents the droppings from rolling away.
Osedax worms a.k.a. zombie worms are deep sea worms that eat the bones of a whale fall, and the microscopic males live inside the females to save themselves the trouble of searching for a mate. One female zombie worm was found to have 111 males living inside her.
Berry Bugs (chiggers) don't burrow into your skin. They drill holes and inject their enzymatic saliva that liquefies your skin cells which they then feed on.
Silverfish have an elaborate mating ritual that involves three steps. In the first step the male and female silverfish stand head to head, facing each other, their wiggling antennae touching. During this time the two silverfish repeatedly retreat from each other and then return to their former position. Once this first stage is the over the male runs away and the female chases after. The third stage occurs when the female catches the male. Once the female has caught the male, the two silverfish stand head to tail, side by side, while the male vibrates his tail against the female. This mating ritual can last for up to 30 minutes.
A tiny fruit fly species named Drosophila bifurca produces gargantuan sperm cells that are 6 centimeters or 2.4 inches long. That’s 20 times longer than the fly itself, and a thousand times longer than the average human sperm.
Sea otters are known to drown baby seals and rape them. They also rape dead female otter corpses. Apparently, their mating ritual is to claw the female and often push the female's head into the water until they submit. Sometimes the females drown and the male just keeps going because he thinks the female is submitting. In fact, otters engage in necrophilia so much that it is beginning to impact their populations.
Slow loris tears are used in traditional Asian medicine. To obtain tears of these big-eyed lorises, skewers are inserted into the animal’s anuses and run through their bodies until they exit the mouth. The still-living animals are then roasted over a fire and the tears that stream from their eyes are collected.
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An elephant can use its penis as a 5th leg to support its weight at times, swat flies, and even scratch itches.
If a female Ferret goes into heat and does not have sex, she’ll die. Too much estrogen will enter the bloodstream, suppress blood-cell production, and she'll succumb to Aplastic Anemia. Also, male ferrets can’t be separated from the female after penetration until they decide to do so, due to their hooked penis.
Male pigs have a drill-shaped penis that spins on its axis like a drill. In the wild, a female pig will mate with a lot of males, and the male’s penis is designed to remove the previous mate’s sperm.