The next morning, Ned feels they are being watched. He passes the day in great uneasiness. That night they hear screams in the distance, then a laugh. The sound of great footsteps reaches their camp just as they see a dim, massive outline. Roxton takes a torch and throws it at the outline, revealing a creature like an enormous frog with its mouth covered in blood. The creature leaves and they agree to keep a watchman stationed from then on.

In the morning they find an animal slaughtered in the iguanodon glade. There is a black circle on the iguanodon’s shoulder. Challenger and Summerlee think it is from asphalt. As they travel, Ned describes the beauty of the land in a lyrical passage for his newspaper readers.

Summerlee argues that they should leave soon, since they now have enough evidence to prove that Challenger was truthful. However, Challenger wants to explore for a few more days. Ned agrees, saying that McArdle would be unhappy if they returned too soon.

Ned climbs a tree to get a better view of their surroundings. On his way up he sees a large, monkey-like creature, its face contorted with hatred. After it flees, Ned reaches the treetop and sketches a map of what he sees, including a lake.