Inquisitive, trusting, and friendly, New South Wales' favorite fish, the Blue Groper, has another trait that makes it special: the females can turn into males!
When a male Blue Groper dies, the largest and most dominant female will turn into a male fish to stabilize the population. "If you take a lot of males out," says Bob Harcourt, associate professor at Macquarie University, "then the females have to spend a lot of their time turning into males, which means they can’t breed and they can't lay eggs." This is getting to be a problem, because although they're protected, people are starting to overfish them illegally. Here's to hoping marine biologists figure out a way to protect Bluey and her/his kind!