With sharp spines, a big, round nose, and a tail they can hang from, prehensile-tailed porcupines (genus Coendou) are nocturnal vegetarian rodents. They have short, thick spines, and their body color runs from yellowish to orange-rust to brown to almost black. They weigh 4 to 11 pounds (2 to 5 kg). Their bodies are 300 to 600 millimeters long, and their tails are almost as long as their bodies, adding another 330 to 485 millimeters. Like howler monkeys, these porcupines use their prehensile tails for grasping and hanging. These tails have no spines, and the upper side near the end has a callus pad.