Some start as boy fish and can become girl fish.
Credit - Freepik
Some girl fish can turn into boy fish when they grow up, especially if there aren't many boy fish around.
Credit - Freepik
These fish start as girl fish and can become boy fish later in life if needed.
Credit - Freepik
They start as girl fish and may become boy fish later if there aren't many boy fish nearby.
Credit - Freepik
Female hyenas are usually bigger and more bossy than the boys. Also, they have a special body part that's a bit like a boy's part.
Credit - Freepik
These slimy creatures have both boy and girl parts. When they mate, they both share their baby-making stuff.
Credit - Google