Sawtooth Spire nyceteris

Malrok rested, but only for a time. He caught his breath, and then he went right back to exploring, all four legs pushing him along the dirt floor. Unintentionally, he nosed into Sitamat, whose legs flailed and bopped him on the nose. Malrok sneezed, but was too curious about the movement to retreat. He continued to poke at his brother with his pugged nose. They had interacted thousands of times at this point, and yet Malrok was still curious. Why all the movement?