What "city boy" mistake does Brain make?

He wakes in the middle of the night; his fire is almost out, so he feeds it again and decides to be more careful. He hears a strange sound outside, and in the morning goes to investigate, finding tracks of a large animal dragging itself across the sand. At first he cannot figure out why—he thinks it must be playing—but then tries to shed this city boy mentality and remember that all of nature’s creatures do things for a purpose. He realizes it was a turtle, and finds a nest of turtle eggs buried in the sand. He is thrilled to find food, but cannot cook the eggs in any way, so he eats six of them raw and saves the rest. As he fights his hunger down, he thinks of the rescuers and hopes they come soon.