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Male millipedes court females with songs and back rubs.
Males are more likely to have hiccups than females.
Male dolphins are called “bulls”, and females “cows”.
Male kangaroos flex their biceps to impress females.
Male ants do not have fathers because unfertilized eggs become males while fertilized eggs become females.
Unspayed females dogs only go into heat twice a year.
Humans, killer whales and short-finned pilot whales are the only species in which females live well beyond menopause.
The skin of a female shark is much thicker than that of a male because males bite females during mating.
Male brains, on average, have a total volume that is between 8% and 13% larger than that of females.
All peacocks are male. The females are called peahens.
Centipede reproduction does not involve copulation. In many cases, males centipedes just leave a spermatophore for the females to find.
Peacocks fake sex sounds to attract females.
Sea worms mate in the following way: at mating time, males and females swarm together. Suddenly the females turn on the males and bite their tails off. The tails contain the males’ testes and sperm. When they are swallowed and acted upon by the females’ digestive juices, they fertilize her eggs.
When leeches mate, the leech playing the male role (leeches are hermaphrodites and can assume either sex) clings to the body of the female and deposits a sac of sperm on her skin. This sac produces a strong, flesh-deteriorating enzyme that eats a hole through the female’s skin and fertilizes the eggs within her body.
Billy goats urinate on their own heads to smell more attractive to females.
The females in the pride tend to do the majority of the hunting. They work as a group and use intelligent hunting tactics to catch prey which they would not be able to catch alone as they are faster than them.