You're walking along base, passing by... Cats? Optimus is a Maine Coon, Bumblebee is a tabby cat, Ratchet is a Bombay, and Arcee is a British shorthair. As for the Decepticons; Megatron is a Chantilly-Tiffany, Starscream is an American bobtail, Knockout is a siberian, as Shockwave and Soundwave are siamese (you can be either a human or cat, your choice)