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Table 5 Behavioural contexts recorded during production of hoo calls

From: Context-specific close-range “hoo” calls in wild gibbons (Hylobates lar)

Context Definition
Feeding Individual is engaged in handling or consumption of an edible item
Separation Individual is separated from the rest of the group, often during locomotion
Alert Individual stares at a fixed point in space for five seconds or more, often accompanied by alarm calls by other species
Ground predator Individual stares at real or experimentally presented predator on the ground. Predator models were a clouded leopard (Neofelis nebulosa), a tiger (Panthera tigris) and a snake (Python reticulatus)
Raptor Individual has perceived a real or experimentally presented raptor. Real raptors were eagle owls, (Bubo bubo). Raptor models were crested serpent eagles (Spilornis cheela)
Inter-group encounter Individual is in visual contact with a neighbouring group
Duet Individual sings with their mate