Most organisms on Snax undergo a gradual transformation in anatomy as they age, but few can be said to truly metamorphosize. In contrast, tadpole crabs grow up to become frog crabs. To reduce competition, the adults feed during the day and mostly eat plankton or small swimming weeds that they capture in their comb-like claws. They lose their tail and instead rely on their flippered legs. These legs easily detach if caught.
During mating season, males will dance to catch the attention of females. If she is receptive, the male will pull off one of his own legs and offer it as a meal to fortify her for the ordeals of pregnancy. While distracted with her meal, the male will then fertilize her eggs. After a short gestation period, the female will lay her eggs inside a large clump of seaweed where they hatch immediately.