Our planet is filled with a dazzling variety of creatures that bump uglies to reproduce. Cats do it. Dogs do it. The birds and the bees definitely do it. But what were the first animals to have sex?
Animals have been sexually reproducing since they evolved, so the first animals to have sex were the first animals to exist. Researchers are still searching for direct evidence of the first animals, but they likely emerged within the last 800 million years, lived in the ocean and looked like sponges.
