The female duck has a complex body. While males show dominance by forcefully mating with her, she chooses which male will father her ducklings by rejecting and redirecting the seed that doesn't suit her.

Meet Dad, aka Mr. Mom. But, kids, don't get too attached, particularly if Dad is a pipefish, a cousin of the seahorse.

No wonder bucks and does scarf up entire backyard gardens: they've got to keep their energy up for their swinging sex lives.

Bed bugs reproduce in mass numbers. This episode explores the violent nature in which the blood-sucking baby bugs are conceived.

Monogamy is the goal of the male garter snake - he’s got to be the only one. Once he’s mated with his female lover, his hopes are high that no other males come along to ‘un-seal’ the deal.

They're the smartest creatures in the sea, and anything goes -- anything.

Male cuttle fish play the field and often sneak into harems posing as females. Once infiltration is complete, the male liberally sows his seed leaving several members of the harem pregnant.

Music, bondage, dancing: different strokes for different spider folk.

The Bible says that Noah brought a male and a female of every species onto his ark, thus ensuring the repopulation of the Earth after the flood. But what would Noah have said to the earthworm who tried to board solo? Or to other animal baby-bakers who are homosexual, transsexual, even nonsexual …

Life and death surround the reproductive activities of salmon. Babies are born into the decay of their dead parents’ bodies but manage to avenge their deaths by eating the parasites that attacked them.