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Echidnas are spiny, toothless, egg-laying mammals -- and they only get weirder from there. Learn more about them in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/mammals/echidna.htm

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https://www.listennotes.com/e/0c7bfcbcafa54c0595acbc0c4dc71a12/