A green spider is classified as an animal even though its green like plants why is a spider classified as an animal?

Not all green things are plants. for example i am wearing a green t-shirt right now and i am quite sure its not a plant. a spider is an animal because it has babies and is properly alive like it runs around and eats and drinks and kills and breathes and most importantly moves! Ever seen a spider be stuck in the ground or being watered? or a plant waalking or drinking from a glass? P.S written by maddy the pig. i can now reveal maddy the pig is the junior school kid!