We can probably just use process of elimination… They don’t have live babies or nurse their young, so not mammals… They’re warm blooded so not reptiles, amphibians, or fish… I think it’s self evident that they aren’t slime, mold, bacteria, or a virus… So, we’re left with birds
Source?
Eggs, beaks, feathers, warm blooded.
F-feathers?
https://wallaceandgromit.fandom.com/wiki/Feathers_McGraw
We can probably just use process of elimination… They don’t have live babies or nurse their young, so not mammals… They’re warm blooded so not reptiles, amphibians, or fish… I think it’s self evident that they aren’t slime, mold, bacteria, or a virus… So, we’re left with birds