Monotremes are animals like the duck-billed platypus that display some characteristics of mammals, but they lay leathery eggs instead of giving birth to live young. Most monotremes that have not gone extinct can be found on the continent of Australia and the islands that surround it. Other animals that live exclusively in Australia and the surrounding territories are kangaroos, wallabies, and koalas. Monotremes often have thick fur like mammals and a bill that is similar to those of ducks. One of the most interesting monotremes in the world is the short-billed echidna. Echidnas lay leathery eggs much like the duck-billed platypus. The young that hatch after about 10 days are completely helpless, so they crawl into a pouch on their mother's abdomen, where they remain safe while they grow. Once they reach the juvenile stage, the echidnas emerge from their mother's pouch to begin foraging for food on their own. Select the sentence that is distracting or does NOT support the main idea of the text.