These 30-ton Apatosaurus are giant fortresses of flesh. However, they are too large to attack, even by fully grown Allosaurus.
— Allen, describing Apatosaurus

Apatosaurus (a-pat-oh-sore-us; name meaning "Deceptive Lizard") originally known as Brontosaurus (which means "Thunder Lizard") is a genus of giant herbivorous sauropod dinosaur that originated during the Late Jurassic period in North America. It belongs to the Diplodocidae Sauropods, obviously a relative of Diplodocus. It was a 23–27 meters long, bulky 35–40 ton sauropod; a 'fortress of flesh'. As such, they were hunted by creatures, such as Allosaurus and other predators. It is arguably the most famous sauropod dinosaur.


Era & DiscoveryEdit

Apatosaurus lived in western North America during the Late Jurassic period from 155–145 million years ago. It shared the environment with other herbivores, including other sauropods, as well as Dryosaurus, Stegosaurus, and Allosaurus. They were first discovered and named by Othniel Marsh in 1877 because the chevron bones were similar to those of a prehistoric marine lizard, Tylosaurus. Since its discovery, Apatosaurus has become arguably the most well known sauropod dinosaur.

Physical AttributesEdit


Apatosaurus was one of the largest sauruopds of the Jurassic and as well as one of the largest dinosaurs to have ever existed. They grew to a staggering 15–20 feet (4.8–6.1 m) tall at the hips, measured 70–75 feet (21.4–22.9 m) in length, and weighed up to 30 tons (60,000 lbs.), more than 12 times heavier than an Elephant.

Apatosaurus were prey for most predators, described as "giant fortresses of flesh", but were too large for any predator to attack, even the largest fully grown Allosaurus. Only the young, injured, sick or old were at risk of predation. However, a healthy old individual could be virtually untouchable beyond a certain age, for sheer size alone. A lone Allosaurus, or even a pack, could stand little chance of taking on a fully grown and mature Apatosaurus, hence why they would likely target smaller, weaker and generally more vulnerable animals.

Apatosaurus was heavy, with a long muscular neck and elephant-like legs. Like their close relatives Diplodocus, Apatosaurus had a long whiplike tail that may have been used as a defense against large predators such as Allosaurus. It also had a sharp claw on each thumb that may have deterred attackers when it reared up on its hind legs to defend itself or reach for higher vegetation. 

Capabilities and WeaponryEdit

  • Long neck: As a sauropod, Apatosaurus possessed a long neck that allowed it to strike at carnivores. 
  • Long tail: Like all sauropods, Apatosaurus possessed a long tail that enabled it to whip and strike at carnivores. 
  • Rearing Up: Apatosaurus is able to rear up on its back legs and could have potentially used its legs to fight carnivores. 
  • Weight: Due to its giant size, Apatosaurus could use its massive wait to crush carnivores. 

Behavior & TraitsEdit

Like all sauropods and other kinds of herbivorous dinosaurs, Apatosaurus were dinosaurs that traveled in herds and probably migrated looking for food throughout the year from area to area. Herds of adults and sub-adults would collectively have weighed hundreds of tonnes, all moving together.

These dinosaurs had to eat a lot of food to keep their massive bodies going. They had to have an enormously long gut to digest all the plant material that it ate. They may have swallowed plant matter whole and ground it up with a gizzard, much as birds do today to grind up their food. They did this because they had very weak chewing teeth but had perfect nipping incisors to pull a vegetation.



  • The sound effects of Apatosaurus are a little bit of lion bellows as well as some elephant sounds and some whale bellows.