I'm Thinking of Something,..

Nope. Some species of them dwell on land, and some in moisture, but a single animal doesn't breathe both types. Just one or the other.

That is, some have lungs, and others have gills, but not both.

None of them belong to the animal class Amphibia.
 
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Nope. Some species of them dwell on land, and some in moisture, but a single animal doesn't breathe both types. Just one or the other.

That is, some have lungs, and others have gills, but not both.




So then it wouldn't be a fish. What's left? Some mammals live in water but they only breathe air.
 
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