[Answer] What are the only two mammals to lay eggs?

Step 1 : Introduction to the question "What are the only two mammals to lay eggs?"

...1. Dolphin and otter 2. Tortoise and turtle 3. Squirrel and possum 4. Echidna and duck-billed platypus

Step 2 : Answer to the question "What are the only two mammals to lay eggs?"

Echidna and duck-billed platypus - Echidnas and duck-billed platypuses are monotremes, the only egg-laying mammals on the planet. Both species are native to Australia and New Guinea. Scientific evidence suggests that platypuses and echidnas diverged from each other 19 to 48 million years ago, indicating that echidnas used to be semiaquatic like platypuses. Researchers suggest that it was by laying eggs in the water that monotremes managed not to be wiped out by marsupials.:

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