> (even assuming we know we're just talking about earth)

This is a nitpick, but life on other planets wouldn't be called “animals”. Animal is a clade defined by common ancestry. The only way you could have an extraterrestrial animal is for it to have evolved on Earth and then migrated somehow, and I think we can fairly confidently rule that out.

Nitpic nitpic. I bet if we find animal like life on other planets people will call them animals. Langage use isn't that pedantic.