A mane is a long, flowing mass of hair that grows along the neck of certain animals, most notably horses and lions. In horses, the mane can vary in length and thickness, often being groomed for aesthetic purposes or to prevent tangling. In lions, the mane serves as a symbol of strength and maturity, with darker and fuller manes often indicating a healthier and more dominant male. Mane hair is made up of keratin, the same protein that forms human hair and nails. The mane can provide protection from the elements and can also play a role in social interactions among animals. For example, a lion's mane can attract females and intimidate rivals, while a horse's mane can help with balance during movement.