Here's why:
* Too broad a category: "Two feet" is a very general characteristic that applies to a vast range of animals, from birds to humans to dinosaurs.
* Variety of classifications: Animals are generally categorized by their species, order, class, etc. "Two feet" doesn't fit neatly into any established taxonomic system.
* Ambiguity: Some animals have two "feet" that are actually legs, wings, or flippers.
Instead of a collective name, you might consider:
* Bipedal: This term describes animals that walk on two legs.
* Specific animal groups: If you're interested in a specific group of two-footed animals, you can use their common or scientific name (e.g., birds, humans, dinosaurs).
Let me know if you'd like more information about a specific group of two-footed animals!