brachiosaurus: the towering herbivore of the late jurassic

weight weigh vertebrate trackways towering tons timeline tall species social small skeleton size significance sauropod research reproduction relatives quadrupedal prehistoric planteater period paleontology paleontologist paleobiology neck museum morphology massive longer long lived legs late jurassic imagery iconic hind herbivorous herbivore head habitat grow giant geology front fossils fossil feet exhibit evolution environment ecosystems ecology discovery dinosaurs dinosaur dietary cretaceous classification brachiosaurus