The correct answer is option 4, Spiny ant-eater. A spiny ant-eater, also known as an echidna, is a monotreme mammal that is found in Australia and New Guinea. Monotremes are a group of mammals that are unique because they lay eggs instead of giving birth to live young. The spiny ant-eater has a long snout and a long tongue which it uses to feed on ants and termites. After the female spiny ant-eater lays the egg, she carries it in a pouch on her belly until it hatches. Once the egg hatches, the young spiny ant-eater, called a puggle, continues to develop in the pouch until it is ready to survive on its own. The spiny ant-eater is one of only a few mammals that lay eggs, making it an interesting and unique creature.