Adult Mantled Howler Monkey with baby (c) Richard Brown
Leaves provide the majority of the diet and are supplemented with flowers and fruit. Because they use leaves it means that their territories can be relatively small and troops of up to about 20 individuals were encountered relatively often. The calls can be heard at over 3km through the forest, and across water (this troop was photographed from a boat) can be heard at up to 5km.
Central American Spider Monkeys take a much higher percentage of fruit in their diet. Thus they generally move further and faster in order to find enough food. They were usually hard to observe, right up in the canopy of the jungle (c) Richard Brown