Apatosaurus is one of several long-neck herbivores on Isla Panadero. First cloned in the early 1990s it is relatively popular due to its low-feeding habits and gentle nature. As with some other long-neck types, Apatosaurus rarely eats from the upper branches like a giraffe, instead foraging ground level plants and low branches. Although they can’t breathe well if they hold their heads up too high, when they do dine on upper limbs, they have a single claw on each foreleg that can grip lower on the trunk for better reach.

Compared to its cousin Diplodocus, Apatosaurus is very heavily built, with stronger bones and a denser muscle base which restricts neck movement slightly. Similar to most, Apatosaurus has longer hind legs than forelegs, leaving for the neck to lean more toward the ground.

These dinosaurs have long, strong tails which are used in defense. They are able to delivery a strong blow to a predator, throw smaller carnivores such as Deinonychus and Velociraptor off of their feet, and in some cases have been observed snapping like a whip to try and scare away hunters. In limited cases Apatosaurus young have been seen walking for short distances on their hind legs to try and reach branches.

While this species continues to grow for most of its life with an average lifespan of 70 years, they reach adult size at 14, and breeding age around 20.