Hedgehogs are well-known for their defensive strategy of rolling into a spiky ball, making it difficult for predators to attack their soft undersides. Pangolins, also known as scaly anteaters, share a similar defense mechanism; when threatened, they curl up into a tight, armored ball, presenting their tough scales to the predator. Marmots, while they may burrow or stand on alert, do not typically roll up into a ball as a primary defense against predation.