- Long, coarse fur: Echidnas have a dense coat of long, coarse fur that helps to insulate them from the cold and wet environment in which they live.
- Spines: Echidnas also have a series of sharp spines that cover their bodies. These spines provide protection against predators and help them to burrow into the ground.
- Beak: Echidnas have a long, narrow beak that they use for foraging for food. The beak is covered in sensory cells that help the echidna to locate prey.
- Pouch: Female echidnas have a pouch on their bellies in which they carry their young. The pouch is lined with fur and provides a safe place for the young to develop.
- Limbs: Echidnas have four limbs, each with five digits. The digits are armed with long, sharp claws that the echidna uses to burrow into the ground and to catch prey.