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 |