What does Sam and Eric’s description of the beast tell us about the boys and human psychology?

Sam and Eric are young and impressionable.... they let their imaginations get away from them. What they really see is the silhouette of the dead pilot in the parachute, and yet, their description of the beast is "it is furry, it has eyes, teeth, claws, wings and it chased them". This description, which is based upon an image produced by fear, cements the idea of the beast as a real physical manifestation of their fears. The boys are only children, and children are filled with imagination. Their fears are embellished with horror especially because they are already without parents and scared on this island.