Puffin couples perform a 'ceremony' before mating where they rub their beaks together.
Male giraffes drink the female's urine to see if she's ready to mate.
Turkeys can reproduce without having sex.
Stick bugs can have sex for up to 79 days.
Female Komodo dragons can impregnate themselves without a male through a process called "parthenogenesis" to force the duplication of sex chromosomes and give birth to male Komodo dragons; keeping the species alive.
In the wild, pandas can mate as many as 48 times in just three hours.
Male ladybugs can spend up to four hours mating with a dead female before they realize something's not right.
Octopi are genetically wired to die soon after mating.
Male llamas bite off other male llamas' testicles to get rid of competitors during the mating season.
Female anacondas strangle and eat the males after mating so they can survive the seven months of fasting during their pregnancy.
The female orb-web spider often eats the male during sex. However, the male's penis is detachable and can still finish the job.
Earthworms mate by joining their clitella (swollen area near the head of a mature worm) with another worm's clitella and exchanging sperm. Then each worm forms an egg capsule in its clitellum
When mating, the male octopus tears off his arm (the one that's also a penis), places it in the female and then swims off to die.
Female dragonflies fake their own death to prevent rape.
Hens store the male's semen after mating and periodically release portions of it for a few weeks to fertilize multiple eggs. If they mate with a male they don't like, they expel the whole thing and produce infertile eggs.