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Male echidnas have a four-headed penis. [26] During mating, the heads on one side "shut down" and do not grow in size; the other two are used to release semen into the female's two-branched reproductive tract. Each time it copulates, it alternates heads in sets of two. [27] [28] When not in use, the penis is retracted inside a preputial sac in ...
The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]
The walrus has an air sac under its throat which acts like a flotation bubble and allows it to bob vertically in the water and sleep. The males possess a large baculum (penis bone), up to 63 cm (25 in) in length, the largest of any land mammal, both in absolute size and relative to body size. [5]
A penis (/ ˈ p iː n ɪ s /; pl.: penises or penes) is a male sex organ that is used to inseminate female or hermaphrodite animals during copulation. [1] [2] Such organs occur in both vertebrates and invertebrates, including humans, but not in all male animals. [3] The term penis applies to many intromittent organs, but not to all.
Baculum of a dog's penis; the arrow shows the urethral sulcus, which is the groove in which the urethra lies. Fossil baculum of a bear from the Miocene. The baculum (pl.: bacula), also known as the penis bone, penile bone, os penis, os genitale, [1] or os priapi, [2] is a bone in the penis of many placental mammals.
The male has internal testes, no external scrotum and a highly unusual penis with four knobs on the tip, [42] [43] which is nearly a quarter of his body length when erect. [44] The gestating female develops a pouch on her underside, where she raises her young. [45] A short-beaked echidna curled into a ball. The snout is visible on the right.
This category has only the following subcategory. H. Human penis (12 C, 66 P) Pages in category "Mammal penis" The following 16 pages are in this category, out of 16 ...
Felines, especially domestic cats, are well known for having penile spines. Upon withdrawal of a cat's penis, the spines rake the walls of the female's vagina, which may serve as a trigger for ovulation. [4] [5] Many other felid species have penile spines, but they are relatively small in jaguars and pumas, and do not occur in margays. [6]