Aphids are a common garden insect. And as Reddit's littlebelugawhale notes, they're weirder than they appear. Most of them are born pregnant and don't need men.

"Most aphids are born pregnant and beget females without wastrel males," the US National Library of Medicine says. "Embryos complete development within the mother’s ovary one after another, in assembly line fashion. These developing embryos contain developing embryos of the third generation within them, like Russian dolls."

Once a year, aphids have sex. The weather induces another "form" for the animal, which produces eggs rather than embryos. Males are also produced asexually.