Proficient aerialists, colobus monkeys swing freely with their arms, extending hands and feet in front of them when landing after a jump. They use the same pathways through the canopy over and over. The size of the home range is influenced by the number of monkeys in the troop, food supply and compatibility with other troops. Territory boundaries are marked by vocalizations, and troops meeting at a boundary jump up and down excitedly for a time. A strong male acts as lead animal, threatening enemies and covering retreats. Besides man, they have leopards and large eagles as predators. When eating, they prefer young tender leaves, and the troop may stay several days on the same few trees. They can withstand cold temperatures.