Internal fertilization with many vertebrates ( such as reptiles, some fish, and most birds ) occur via cloacal copulation ( see also hemipenis ), while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.
12.
For example, the hemipenis of the Siamese spitting cobra ( " Naja siamensis " ) is smooth with blunt ends, while that of the many-spotted cat-eyed snake ( " Boiga multomaculata " ) is entirely covered in hooked spines and spicules.
13.
Hemipenis like that of " frenatus " in general construction, but the calyces smaller, more deeply scalloped, and packed so closely together that only the papillae are visible on the surface; the spines are shorter, thicker and more numerous; there is a fold.
14.
This is one hypothesized reason for males having two pensises instead of one : as each hemipenis is associated with one testis and only one side can be used during mating, having a second hemipensis functions as a " backup " and ensures that mating can continue even if one side were to run out of sperm.
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