Penile sheath

In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization.

[5] In some bat species, the prepuce contains an erectile tissue structure called the accessory corpus cavernosum.

When rubbing trees with their horns, these stags sometimes move the penis back and forth rapidly inside its sheath.

[10] Male bison and fallow deer have tufts of fur at the end of their penis sheaths.

[11] In rodents, the length of the prepuce is related to urine marking behavior.