Apatosaurus elusivii (name meaning "elusive deceptive lizard") is a species of large herbivorous sauropod dinosaur that originally lived in North America during the Late Jurassic period, but has since been brought back from extinction by SciiFii and now lives in the Jurassic Trails section of Cretaceous Park. Apatosaurus elusivii can grow to an average length of 21–22.8 metres (69–75 feet), and an average mass of 16.4–22.4 tons (16.1–22.0 long tons; 18.1–24.7 short tons). However, a few specimens grew to a maximum length of 11–30% greater than average and a mass of 32.7–72.6 t (32.2–71.5 long tons; 36.0–80.0 short tons). The cervical vertebrae of Apatosaurus elusivii are less elongated and more heavily constructed than those of Diplodocus, a diplodocid like Apatosaurus elusivii, and the bones of the leg are much stockier despite being longer, making the Apatosaurus elusivii a more robust animal than Diplodocus. The tail is held above the ground during normal locomotion. Each forelimb of Apatosaurus elusivii have a single claw and three claws are on each hindlimb. The Apatosaurus elusivii skull is very similar to other Diplodocids such as Diplodocus. Apatosaurus elusivii is a generalized browser that keeps its head elevated. To lighten its vertebrae, Apatosaurus elusivii has air sacs that make the bones internally full of holes. Like that of other diplodocids, its tail is normally used as a whip to create loud noises. The eggs of Apatosaurus elusivii are laid around 5-6 months after mating seasons, the eggs hatch around 3-4 months after that, and the young are cared for by their parents until they are halfway between hatchlings and adults in age.
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