They are hermaphrodites, meaning they have both male and female sex organs, and because they are stationary, their very long appendages come in useful, reaching to blindly deposit sperm to nearby crustaceans. While the Blue Whale takes the top spot for the largest penis in the world, the barnacle impressively has the largest penis to body size ratio their genitalia are remarkable eight times their body length! However, it has been discovered that these vaginal folds outside their vagina allow them to block penetration, allowing the female some choice in the reproductive process. These dolphins surround the female and take their turn, seemingly giving her little choice in who impregnates her. However, we do know that when it comes to mating time, males travel in packs of two to four dolphins to ward off competitors. With the oceans being vast and wide, a lot is unknown about the cetacean mating behavior. This is likely so that they can navigate the labyrinth of the female’s reproductive system, which has extensive vaginal folds. Dolphinsĭolphins have a fibro-elastic prehensile penis that is remarkably dextrous, able to swivel and grope to find its target, and come in a variety of different shapes and sizes. For urination, defecation, and in females, egg-laying, they have a separate all-in-one opening called the cloaca. Unlike other mammals, the Echidna only uses their penis for mating. When not erect, the penis sits within its body, emerging from a preputial sac when use is required. And like the rest of its spiky coat, the penis has sharp penile spines, which are said to function as an ovulation trigger or increase the success rates of fertilization. The females have a two-branched reproductive tract, so the two heads of the penis fit perfectly. Very economically, they can alternate which half they use.
Even more strangely, only two of these heads are used simultaneously, with the other half of their penis shutting down. The Echidna, an already strange animal that lays eggs like fish and birds but produces milk like other mammals, has a four-headed penis because apparently, just one isn’t enough. Their penis is also very agile, with two muscles attached to the pelvis giving it a good range of motion and allowing it to alter its shape depending on the anatomy of the female. The phallus is usually contained within the genital slit on the whale’s underside, protruding only when use is required. Not only this, but each testicle can weigh up to one hundred and fifty pounds, and gallons of sperm are ejaculated at once. Proportionally, they also boast the largest phallus, ranging from eight to ten feet (2.5-3m), with a one-foot diameter. The Blue Whale Penis and Eight Other Bizzare Male Genitalia Blue Whalesīlue Whales are commonly compared to the size of a basketball court, reaching lengths of up to 95 feet (29m). From sizes, shapes, quantity, function from spirals to forks to penises used like swords…there is no such thing as two penises being precisely the same. We can see, from this, just how the organ can vary over time in one species, let alone over hundreds of thousands of species.
The science of evolution is miraculous, isn’t it? The loss of penile spines and the evolution into smooth penises may have resulted from our mating patterns and an increase in monogamous relationships, paving the path for increased complexity in our social structures. It is believed that the human once had small penile spines: barb-like structures that feature many animals’ genitalia we see today. They are a rapidly evolving structure so that even between closely related species, they can differ magnificently. But let’s talk for a moment about penises in general.
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