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Female Flies’ Previous Lovers Affect Size of Later Children

A female fly’s previous sexcapades can have a profound effect on how her future children look, redefining the way scientists think about inheritance in insects.

“Killer Sperm” Found, Prevents Worms From Cross-Breeding

In the first identified case of “killer sperm,” females that mate with males of another species can become sterile or even die, a new study says.

Mosquito Sperm Follow Their “Noses” to an Egg

Proteins on mosquito sperm enable them to sniff their way to waiting eggs in female mosquitoes.

Sperm Hoarders: Why Animals Store Semen

Some female animals—including fish, snakes, and octopi—store sperm in their reproductive tracts for years after mating. But why?

Sperm Works Best in the Winter, Study Finds

Spring may be when a young man’s fancy turns to love, but new evidence suggests that it’s winter when his sperm is at its spunkiest.

Barnacles Leak Sperm Into Ocean, Upending Mating Theory

Barnacles, already famous for having longest penises in the animal kingdom (relative to size), have another reproductive quirk.

Naked Mole Rat Sperm Revealed

Even lazy sperm can get the job done—at least if you’re a naked mole rat, a new study says.