Hunting animals that stand out from the crowd because of their impressive horns or lustrous manes could lead to extinction, according to a study.
Research predicts that removing even 5% of high-quality males risks wiping out the entire population, for species under stress in a changing world.
Animals prized by trophy hunters for their horns, antlers or tusks usually have the best genes, say UK scientists.
Removing these could push a species over the edge, they warn.