This yellow dinosaur looks just like an inflatable balloon, complete with seams, wrinkles, and a shiny gold air valve. Luckily, this giraffe-necked Brachiosaurus is made of clay and will never deflate! The first Brachiosaurus fossils were discovered in the late 19th- to early 20th-century in Colorado, and today it is a common favorite amongst dinosaur enthusiasts. See if you can find a Brachiosaurus in your favorite dinosaur movies.