Eastern gray squirrels produce moans for aerial predators and quaas for terrestrial threats. One commonly-supported hypothesis for such predator-associated signals is that they elicit predator-specific escape responses in conspecifics. With simulated aerial predators, squirrels ran to the far side of tree trunks. In response to simulated terrestrial predators, squirrels frequently ran to where they could see the predator but could quickly flee to the far side of the tree trunk. Playbacks of quaas and moans elicited flight behaviour, but without association between escape location and alarm call type. Locations elicited by alarm calls differed from those elicited by simulated predators, with squirrels pausing on the side facing the call’s source. While grey squirrel alarms and escape strategies differ by predator type, the vocalizations do not function to elicit divergent escape strategies in conspecifics. This result stands in contrast to observed functions in other species with calls differing by predator type.
Ground squirrel tail-flag displays alter both predatory strike and ambush site selection behaviours of rattlesnakes. —
Proc. Roy. Soc. Lond. B: Biol. Sci.279:
Pursuit-deterrent communication between prey animals and timber rattlesnakes (Crotalus horridus): the response of snakes to harassment displays. —
Behav. Ecol. Sociobiol.59:
Predator-associated vocalizations in North American red squirrels, Tamiasciurus hudsonicus: are alarm calls predator specific? —
Predator-associated vocalizations in North American red squirrels (Tamiasciurus hudsonicus): to whom are alarm calls addressed and how do they function? —
What is communicated in the antipredator calls of lemurs: evidence from playback experiments with ringtailed and ruffed lemurs. —
Animal signals: motivational, referential, or both?. — In:
Nonverbal vocal communication: comparative and developmental approaches. Studies in emotion and social interaction (
PapoušekH.JürgensU.PapoušekM. eds). Cambridge University PressNew York, NY p.
Auditory communication among vervet monkeys (Cercopithecus aethiops). — In:
Social communication among primates (
AltmannS.A. ed.). The University of Chicago PressChicago, IL p.