Creatures with Cocks: Hilarious Adults-Only Cartoons for Lovers of the Natural World and Dick Jokes

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The papilla (nipple-like projection) on the dorsal (upper) side of the penis is covered with small spines, a character the marsh rice rat shares only with Oligoryzomys and Oryzomys couesi among oryzomyines examined. In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms.

This special less-armored area of their abdomen might minimize harm as the male injects his sperm into the female’s circulatory system. The beech marten's penis is larger than the pine marten's, with the bacula of young beech martens often outsizing those of old pine martens. Many of the creatures packing the most surprising phalluses are hermaphrodites, meaning they also have female reproductive organs.

The penis of the ring-tailed lemur is nearly cylindrical in shape and is covered in small spines, as well as having two pairs of larger spines on both sides. Its penis can be as long as 35mm ( 1 + 1⁄ 2in), and usually remains completely withdrawn inside a skin receptacle. While it's still a bit of mystery as to why they have four heads, a recent study did determine how they function: The urethra and the main blood vessel of an echidna's penis split into four parts, one for each head.

The endpoint culminates in a five-lobed head that discharges semen from four different branches (think: Ridley Scott's Aliens franchise).Meet Chromodoris reticulata, a type of sea slug, that has to reckon with a scary reality: sex means saying goodbye to their penis.