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That's a subjective question, but here are a couple of candidates:

1) The platypus or the echidna, as the only egg-laying mammals.

2) The naked mole rat, as the only mammal that breeds like a colony insect.

3) The human being, as the only animal to make and wear clothes, talk and other things.

4) The lowland gorilla, as the only animal whose common and scientific names are all the same word.

5) The penguin, as the bird that spends most of its life underwater.

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12y ago

What else can I help you with?