Here are top 5 most bizarre animal mating behaviors ever known to man.
5. Giant Panda
Giant Pandas are famously difficult to get to mate in captivity - at least until some bright spark in China discovered that showing them panda porn seems to help increase their libido! In 1998 the result of showing panda porn lead to the population of pandas in Wolong zoo to more than double.
The Anglerfish has one of the most unique mating methods. When a male is born, it has no digestive system so it needs to find a female (all of which do have digestive systems) quickly. When it finds a suitable female, it latches on to the side of her by biting her and it releases an enzyme that melts her skin causing the two to fuse together. The male then wastes away and the female has a permanent supply of sperm to fertilize her eggs on demand.
3. Red-Sided Garter Snakes
These snakes are small and poisonous, and live in Canada and the Northwestern United States. Their highly unusual mating takes place during an enormous orgy. Hundreds snakes slither together in a large den, eager to copulate. In that pile, one female may have as many as 100 males vying for her. These ‘nesting balls’ grow as large as two feet high. Now and then a female is crushed under the heavy mound.
Bedbugs mate by “traumatic insemination” - what this means is that the male doesn’t even bother with the female sexual organs - it simply stabs the female with its own sword like sexual organ in any part of her body. Lovely. This form of mating is thought to have evolved as a way for males to overcome female mating resistance.
Female giraffes associate in groups of a dozen or so members, occasionally including a few younger males. Males tend to live in “bachelor” herds, with older males often leading solitary lives. Reproduction is polygamous, with a few ol der males impregnating all the fertile females in a herd. Male giraffes determine female fertility by nudging the females backside until she urinates in his mouth - he uses the taste to determine whether the female is in heat.
Source: The List Universe