Male kangaroos develop powerful front limbs and exhibit a dominance behavior commonly known as "boxing." When two male kangaroos confront each other, they draw close; they then swat at their opponent with their front claws while also pulling their own heads back out of range. Kangaroos also occasionally rock back on their tails before delivering a blow with their heavily muscled hind legs. The claws on their back legs make these blows particularly deadly, and a kangaroo can disembowel an attacker with a single strike using this tactic.