Orangutans can retract their penises in order to create a cavity another male can penetrate.
Male river dolphins are known to insert their penis into one another’s blowholes.
Lions can have sex up to 150 times in two days. They mate frequently because it is believed that lionesses only ovulate after multiple copulations. It has been estimated that for every one cub born (and survives through his first year), its parents had to have sex 3,000 times.
A male ostrich will turn bright red on the neck, face, and thighs as his testosterone levels rise. To attract the female, he drops to his knees, rocks from side to side, and slaps his back with his neck.
Female hyenas usually have twins. The new cubs start the fight for dominance directly after birth.
The male ostrich is one of the only birds that have a penis.
Lar Gibbons sing to define their territory, strengthen family relationships, and fight for dominance.
Male bottlenose dolphins partake in homosexual activities to release sexual tension until they father young. Even after the male starts to mate with females, the homosexual bonds do not break.
Male European wolves’ penises swell before sex, but the swelling takes an hour to subside. This situation is called a dog knot and, because the male cannot pull out of the female, no other males can mate with her.
In all female animals, orgasm changes the air pressure in the uterus creating suction. Orgasm can allow the female control over fertilization.
Male nurse sharks have two members to deliver sperm, called claspers.
Female blue sharks have thicker skin than males on their back and flanks. This thicker skin is protection against the males’ bites during mating.
The female Spadefoot toad lays over 1000 eggs, which hatch within 24 hours. The young are fully mature within less than two weeks.