Is a seal bird mammal or fish?

That's a tricky question! The term "seal bird" doesn't refer to any specific animal. Here's why:

* Seals are mammals. They breathe air, give birth to live young, and nurse their babies.

* Birds are also not fish. Birds are warm-blooded, lay eggs, and have feathers.

* Fish are aquatic animals that breathe through gills and have scales.

It's possible that "seal bird" is a misunderstanding or a made-up term. If you're trying to identify a specific animal, please provide more information!