NEW YORK (AP) — If in the beginning there was male and female, fish seem to have forgotten the memo. For nearly 500 fish species, including the clownfish in “Finding Nemo,” the great divide between ...

University of Otago – Ōtākou Whakaihu Waka scientists have discovered that it takes mere minutes for a species of sex-changing fish to develop dominant behaviour after a change in the pecking order.

Animals that can change their sex naturally might sound surprising at first, but in nature, it is simply another survival ...