He is a Microraptor gui, and first appeared in The Land Before Time XII: The Great Day of the Flyers Guido is convinced that he's the only one of his kind, having never seen another of his kind before. His origins are unknown, as he apparently has no idea what he is or where he came from. Though he tries to fly, he can only glide for a brief period of time. He reappears in the TV episode "The Hermit of Black Rock", in which he and Petrie meet an old blind purple Harpactognathus named Swooper, and learns to fly properly. He often appears neurotic or panicky at times, and easily confused.