[Ninja]

A species that has homosexual members, has much better survival chances. This is because gay couples don't procreate, thus contributing to a better child/adult ratio. Because they don't have offspring of their own, there will be more adults for every child that is already here. This is especially crucial for humans in an environment with many predators, since human infants can't even walk, let alone run for their lives when a hungry lion steps onto the scene. They are utterly helpless and the more adults are watching over them, the better.