Penis
Domestic cats have barbed penises, with about 120–150 one millimeter long backwards-pointing spines. Upon withdrawal of the penis, the spines rake the walls of the female's vagina, which is a trigger for ovulation. Lions also have barbed penises. Male felids urinate backwards by curving the tip of the glans penis backward. When male cheetahs urine-mark their territories, they stand one meter away from a tree or rock surface with the tail raised, pointing the penis either horizontally backward or 60° upward.
Chato Murciano
Along with its short nose, the breed usually has a black or white color and has small sized heads. Generally the head Chato Murciano can grow up to 28.5 cm long and 20 cm wide after reaching 12 years of age. This is only a 2–4 cm growth from when it is one year old. On its head, the snout increases size up to 10.5 cm but then decreases to about 9.5 cm when the pig reaches twelve years of age. Pigs at about 3.5 years or 12 years have their eyes separated from each other at about 16 cm where at 1 year, they are separated by 12.5 cm.