Max and Otis are twin monkeys. At a very early age they were orphaned and rendered tailless in a horrific airship accident. As a result, they turned to grifting on the mean streets of Manhattan, where they learned to rely only on each other. The brothers honed their trade and developed a distinct way of communicating in order to facilitate their grifting. When max detects Otis in the immediate area, he lets out a quiet, high-pitched "eee-EEE eeEEE" (monkey sound) to let his twin brother know that that the scam is on.