This one I would rate as easy. The mammal is probably one of the most well known extinct animals of all time
Reminder: hide your answer behind a content warning. This will allow others to guess without a hint. I will post the answer tomorrow (and to anyone who guesses correctly).
@TheDinosaurDave Off topic, but: please don't use URL shorteners! They are unnecessary here (all URLs count as the same length), they bring trackers in, and they introduce a potential point of failure.
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