- An adult male gorillas becomes a “silverback” at about age 15 when he is full grown and the hair on his back turns silvery-gray. (Koko.org)
- Troops are led by one dominant, older adult male, often called a silverback - The leader organizes troop activities like eating, nesting in leaves, and moving about the group’s 0.75-to-16-square-mile (2-to-40-square-kilometer) home range.
- Those who challenge this alpha male are apt to be cowed by impressive shows of physical power. He may stand upright, throw things, make aggressive charges, and pound his huge chest while barking out powerful hoots or unleashing a frightening roar.
- Despite these displays and the animals’ obvious physical power, gorillas are generally calm and nonaggressive unless they are disturbed. (NatGeo)