After eating some eggs that he found laying around, Chomper notices all of the adults looking around the valley for some reason:
Chomper: "What are you doing Mr. Threehorn?"
Topps: "We are looking for Mama Swimmer's missing eggs. You haven't seen them have you?"
Chomper: "Umm... No...." 

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Topps: Here you are, Chomper. Today we are going to make big trainings in the Valley, where adults show their strenght, determination, and ability to remain teamwork in our holy duty - in protection and successful banishing all types of sharpteeth who invade our home. And we are looking for candidate fore role of sharptooth...
Chomper: *gulps* You know, mr. Threehorn? I have just remembered - me and Ruby have to do something in the very deep part of Hidden Caves! *disappears from Topps's field of vision so fast as his chicken' run lets him*