According to the Dino Protection Group website, InGen scientists travelled back to Isla Sorna in 1999 and illegally cloned 4 new species. These species are Ankylosaurus, Corythosaurus, Ceratosaurus and Spinosaurus, whom all made their debut in this film. This explains why these 4 dinosaur species were absent from Il mondo perduto - Jurassic Park (1997) (which takes place on the same island), and why Spinosaurus wasn't on InGen's list.

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