Humans have stronger arms than T-Rexes. While some scientists once theorized that dinosaurs had a second brain in their rear-ends, this is false. The longest dinosaur neck spanned over 40 feet. The T-Rex roar sounds in Jurassic Park were made using both alligator and tiger roars. Some dinosaurs engaged in cannibalism. Deinocheirus is classified as a dinosaur. Nicolas Cage had to return an illegally obtained dinosaur skull from Mongolia.