The Y'bith differ from typical Bith in a number of ways, possessing a small, vaguely fish-like mouth, large hands and feet, sensitive skin and poor eyesight (even by Bith standards, as even non-mutant Bith are typically nearsighted). It's also claimed that their volatile biochemistry makes them more unstable and prone to aggressiveness, which contrasts with the typically peaceful nature of the Bith race.