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

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A series of muscular contractions delivers semen, containing male gametes known as sperm cells or spermatozoa, from the penis. A description of a new species of Pipistrellus (Chiroptera: Vespertilionidae) from Madagascar with a review of related Vespertilioninae from the island". But a few, such as the Argentine lake duck, more than make up for it, says Miss Cellania at Mental Floss.

In Thomasomys ucucha the glans penis is rounded, short, and small and is superficially divided into left and right halves by a trough at the top and a ridge at the bottom. It was only years later that they discovered the swimming organ was actually a zombielike sperm bomb. Comparative gross morphology of male accessory glands among Neotropical Muridae (Mammalia: Rodentia) with comments on systematic implications". Mating leopard slugs dangle from branches by a shared rope of their own slime with their penises hanging below.A new species of Thomasomys (Rodentia: Muridae) from eastern Ecuador, with remarks on mammalian diversity and biogeography in the Cordillera Oriental". The outer surface of the penis is mostly covered by small spines, but there is a broad band of nonspinous tissue. All four heads won't fit into a female, so during mating, the heads on one side shut down and do not enlarge; the other two release semen into the female's two-branched reproductive tract.

This evolutionary quirk puzzled scientists for years until they observed the animal’s behavior – with up to a dozen males following one female, four heads are necessary to deploy more sperm than the competition. Male orb spiders detach their penis and insert them in female spiders to impregnate them, says Jennifer Welsh at LiveScience. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Once the slugs complete copulation, they " crawl away with their elongated penises still dangling," and then the organs suddenly sever from their bodies and float away.The pseudo-penis closely resembles the male hyena's penis, but can be distinguished from the male's genitalia by its greater thickness and more rounded glans. When trying to impregnate another worm, for example, a flatworm tries to pierce the skin of the other using its penis. Males of Racey's pipistrelle bat have a long, straight penis with a notch between the shaft and the narrow, egg-shaped glans penis.