Hedgehogs: Hedgehogs are small mammals have a unique defense mechanism where they roll up into a tight ball, using their sharp spines as a form of protection against predators. Marmots: Marmots do not roll up to protect themselves. Instead, they typically rely on burrows and their ability to give warning calls to avoid predators. Pangolins: Similar to hedgehogs, pangolins also roll up into a ball when threatened. They use their tough keratin scales as armor to protect their vulnerable parts.