These elongated, two-legged creatures move by hopping, using their short forearms for balance. Males have vibrant shades of green, purple, and blue, whereas females are orange and brown. Rabbucks have two sail-like crests, which extend from the head and exchange heat with the environment. Their short, stubby tails vibrate rapidly to communicate danger to other members of the herd.
Rabbucks live in arid plains and foothill deserts with sandy dunes and scattered vegetation. They occupy burrows during the hottest parts of the day, and remain dormant during the hottest part of the year.
During the growing season, rabbucks prefer to consume the tough but nutritious fruit of the daba brush, which few organisms other than rabbucks can digest. They can also use their forearms to dig up the fleshy roots of vegetation, which they consume when fruits are unavailable. When these preferred foods are rare or absent, rabbucks consume the tough, spiny vegetation that grows under arid conditions. Their gums are strong and durable enough to “chew” the food. They have bony teeth plates that continue to grow throughout their life spans.
Rabbucks live in groups of 15-30 individuals, consisting of a single adult male, multiple adult females, and their offspring. The male mates with all females in the group and prevents other adult males from joining the group. Males that do not belong to a group wander the plains, sometimes attempting to sneak into a group temporarily to mate with a female. When discovered, a sneaking male will be chased by the resident male. Rarely, these encounters escalate to the point where males fight, using their bony teeth plates as a weapon. Fights between males are bloody, and smaller, weaker males sometimes perish in the process. After mating, females carry the developing embryos for nearly 120 Phygarian days before bearing live young. Baby rabbucks can hop within a few minutes of birth and remain with the group until the next breeding season. Although male offspring always leave the group upon reaching maturity, a female will stay with the group if a new male takes control between the time she was conceived and the time she was born.
Rabbucks are extremely fast, reaching speeds up to 107 kilometers per hour for brief periods.