Unusual animals often have unique adaptations that help them survive in their environments. For example, the axolotl is a type of salamander that remains in its larval form throughout its life, retaining its gills and aquatic lifestyle. This fascinating creature can regenerate lost limbs and even parts of its heart and brain. Another unusual animal is the platypus, a mammal that lays eggs instead of giving birth to live young. It has a duck-like bill, webbed feet, and produces milk to feed its young. The platypus is one of the few venomous mammals, with males possessing spurs that can deliver a painful sting.