Big bird is a dinosaur. we know that cus all birds are dinos. but if we do a little more research, we see his eyes are front facing, meaning he is a predatorial bird. and we also know he is slightly over 8ft tall. he has wings, but cant fly. and from all this info, we discover that his close ancestors are what is known as a terror bird. the name speaks for itself. look it up on google if you want a pic.