Gennaro does not care for Malcolm's pessimism and is still annoyed about the presence of the children. Gennaro, Malcolm, Regis, Grant, Sattler, and the children are taken on a tour of the island in two electrically automated Land Rovers. The tour begins with the hypsilophodontid habitat, but the group is unable to see the animals. But Tim spots an othnielia in the trees. A pre- recorded mating call rouses several hypsilophodontids.

Arnold and Robert Muldoon, the head animal warden, argue with Hammond about the island's many problems. Hammond ignores them, saying "oh balls." The tour passes a group of dilophosaurs—a brightly colored breed that had the park operators had just discovered to be poisonous—and then some triceratops. Lex, Tim's sister, is annoyed that the animals seem so boring and inactive.

While the tour group waits outside the tyrannosaurus paddock, Muldoon ponders how dangerous the park is. No one had any idea that the dilophosaurs could spit venom until one of the handlers was almost blinded. Muldoon is especially wary of the velociraptors, which had killed two construction workers and were adept at breaking out of their cages. On the tour, a live goat is used to lure the tyrannosaurus, which finally appears and eats the helpless animal.

Hammond, sitting in the control room, listens over the radio to the tour group discuss the unpleasant consequences of the t-rex ever escaping. He is annoyed at their negativity. Muldoon walks down to the basement and puts a rocket launcher in his jeep, one of only two gas-powered cars on the island. Tim claims to see a mid-sized raptor running through a field. Because of a developing storm and insufficient protection at the dock, Hammond is forced to call off a supply ship before it unloads the equipment he has ordered.

The tour stops to see Dr. Harding, the island vet, who is treating a sick stegosaurus. Dr. Sattler figures out that the animals are falling ill because they are eating a certain kind of berry. Grant finds the remains of a raptor eggshell, which is odd considering the animals have supposedly been engineered to be unable to reproduce.

Malcolm points out an error in the park's computerized tally of the animals. The tallying system, which had been designed primarily to make sure none of the animals went missing, fails to account for the appearance of any extra animals. Upon Malcolm's suggestion, the computer shows that there are more procompsognathids, maiasaurs, othnielias, hypsilophodontids, and velociraptors than expected. Somehow the animals are breeding.