One can call any flying (or even non-flying) feathered thing a bird (excluding oddities such as bats). But what would we call any animal that stays on the ground? A ground animal?
Note: this isn't a homework question or anything, it's a word I want to use to describe a class, which inherits from
Edit: Clearly this is a very broad question, I believe that I should be more specific. So lets narrow the choices of "ground animals" to those that you could find in a zoo, which means not bugs, dinosaurs, etc.