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.
Pandas will sometimes fake pregnancies to receive more food and special treatment from humans
if a pregnant woman has organ damage, the baby in her womb sends stem cells to help repair the organ.
Turkeys can reproduce without having sex.
The existence of pregnancy makes it so the statistical average number of skeletons in a human body is greater than one.
Only pregnant females polar bears hibernate
Female stingrays can store a male's sperm for years and use it to become pregnant whenever they want.
Aphids are born pregnant
Male giraffes drink the female's urine to see if she's ready to mate.
Pregnancy physically changes a woman's brain structure. Grey matter volume is decreased in certain areas, giving mothers a higher capacity for empathy to help better understand their baby.
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.
Female anacondas strangle and eat the males after mating so they can survive the seven months of fasting during their pregnancy.