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?

A study has found that the reason why the evolution of the first animals to appear on Earth was delayed for over 10 million ...

Animal reproduction encompasses the full sequence from gamete formation through fertilisation, embryonic development and parturition. In farm and companion species alike, natural breeding is ...

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Some animals can have babies without the need to mate. Colloquially called a "virgin birth," this occurs through a process called parthenogenesis, wherein a female animal creates an embryo from an ...

At first glance, a lizard and a salamander can appear surprisingly alike. Both usually have long bodies, four limbs, and ...