A massive earthquake then destroys their home, and to avoid carnivores and omnivores, they descend down into a tropical forest that lay hidden behind their cave all the time. Encountering a "Macawnivore", a brightly colored feline that Gran dubs "Chunky", the family flees him until he is scared off by swarms of piranhakeets that devour a ground whale. Using another horn, Eep calls to Guy who rescues them from the birds with his fire. After a great deal of confusion regarding their first contact with fire, Grug imprisons Guy in a log until he can guide them somewhere safe. Guy suggests the Croods go to a mountain where there are caves because the Crood family desires a cave. Grug refuses at first, but he decides to go with the promise of a cave. The other Croods were worried that they would get tired and bicker, but Grug doesn't listen.