Aphids give birth to other pregnant aphids.
“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.
