Does novelty influence the foraging decisions of a scavenger?

Abstract

Acquiring knowledge about the environment is crucial for survival. Animals often driven by their exploratory tendencies gather valuable information regarding food resources shelter mating partners etc. However neophobia or avoiding novel environmental stimuli can constrain their exploratory behaviour. While neophobia can reduce potential predation risks decreased exploratory behaviour resulting from it may limit the ability to discover highly rewarding resources. Dogs (Canis familiaris) living in semi-urban and urban environments as free-ranging populations although subject to various selection forces typically have negligible predation pressure. These dogs are scavengers in human-dominated environments; thus selection against object- neophobia can provide benefits when searching for novel food resources. Although captive pack-living dogs are known to be less neophobic than their closest living ancestors wolves (Canis lupus) little is known about free-ranging dogs' behavioural responses to novel objects particularly in foraging contexts. Using an object choice experiment we tested 259 free-ranging dogs from two age classes adult and juvenile, to investigate their object-neophobia in a scavenging context. We employed a between- subject study design providing dogs with a familiar and a potentially novel object, both baited with equal hidden food items. Adult and juvenile dogs significantly inspected the novel object first compared to the familiar one even when the hidden food item was partially visible. To validate these findings we compared novel objects with different strengths of olfactory cues (baited vs. false-baited) and found that they were inspected comparably by adults and juveniles. No significant differences were found in the latencies to inspect the objects suggesting that free-ranging dogs may still be cautious when exploring their environments. These results indicate that free-ranging dogs evidently from an early ontogenetic phase do not show object-neophobia as demonstrated by their preference for novel over familiar food sources.Weconclude that little to no constraint of neophobia on exploratory behaviour in semi-urban and urban- dwelling animals can guide foraging decision-making processes providing adaptive benefits.