ocr: Lion dentirication: Unmistakable. emales are smaller than males and lack a mane. Males begin to show a noticeable mane growth at 1.5 - - years old which is fully developed by the time they are five or SIX. Some males never grow particularly fine manes and in certain areas they do not grow manes at all. Lions have a claw-like, horny spine in their tail-tutt. Other Lion Topics: Habitat I Predation I Reproduction