The red parts of its body are not yet rough enough to hurt enemies, so it toughens them up by brushing them along the walls of caves.
Dwelling in caves, it spends most of its day purposely brushing against the walls to toughen the red parts of its body. Its lower jaw is what it prefers to train, tearing through tough meat like a savage.
To toughen the spikes that it uses as teeth, it often bites tough rocks. It sometimes ends up eating rocks due to breaking them.