western hoolock gibbon

Activity patterns. In Bangladesh, Western Hoolock Gibbons spend their days feeding (30 - 8 %), foraging (25 - 8 %), resting (27 - 5 %), and traveling (7 - 4 %), besides calling and engaging in territorial behavior and play. In India, play and grooming activities contribute less than 10 % oftheir daily activities. They rest and play more in the longer days of summer. Gibbons are active for 8 - 10 hours, starting at dawn or in the early morning, waking earlier in summer than winter. Pairs of Western Hoolock Gibbons call in the morning before leaving their sleeping sites on most but not all days and sometimes in the afternoon before retiring. They alternate their calls as a “ double solo ” rather than producing duets. Feeding dominates the morning hours and rest in the early afternoon. Activity ends usually several hours before sunset, possibly to avoid competing with other primates at their feeding trees. Preferred sleeping sites are emergenttrees, often those infested with epiphytes; mid-canopy trees are less preferred. A female and her infant sleep together, generally with the adult male; older offspring sleep separately.