Implications of tactile enrichment on the behaviour and whisker movements of four species of carnivorans

Nakhwa, Amisha A, Breakell, Vicki, Chambers, Lewis, Elder, Alyx, McLoughlin, Emma, Roberts, Sarah, Todd, Katherine and Grant, Robyn A ORCID: https://orcid.org/0000-0002-3968-8370 (2024) Implications of tactile enrichment on the behaviour and whisker movements of four species of carnivorans. Applied Animal Behaviour Science, 274. 106261. ISSN 0168-1591

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Abstract

Caniformia include a range of aquatic, semi-aquatic and terrestrial species, which reveal diversity in their whisker arrangements and shape. Whisker movements play a crucial role in the perception of tactile information, allowing whiskered mammals to distinguish between shapes, sizes, and textures. Despite the significance of whisker movements in sensory perception, few studies have focussed on measuring whisker movements during tactile sensing. Whisker enrichment tasks have the potential to expand behavioural repertoires of animals in captivity and reduce stereotypical behaviours. However, despite whiskers being essential in guiding foraging and exploration in many mammalian species, tactile whisker enrichment tasks are rare. Here, we utilised a novel tactile enrichment device to investigate the whisker movements in four Caniform species in captivity, including two pinnipeds- South African fur seals (Arctocephalus pussilus) and harbour seals (Phoca vitulina), a mustelid – Eurasian otter (Lutra lutra), and a canid – red fox (Vulpes vulpes) during a texture discrimination task. This study is the first to explore the impact of tactile enrichment on the behavioural repertoire of caniforms in captivity and provides the first insight of whisker movements in South African fur seals. The introduction of the tactile enrichment device did not increase the behavioural repertoire, nor did it lead to an increase in stereotypical behaviours or aggression in any of the species. However, it did successfully encourage natural whisker movements in the pinnipeds and otter. The whisker amplitude measure was especially high in the South African fur seals. We suggest that such a complex, discrimination-based enrichment task might only be feasible for more trainable caniforms, such as pinnipeds, rather than more neophobic species, such as the red fox, which did not interact with the enrichment device throughout the study. Therefore, while our enrichment device increased natural whisker movements, an even simpler foraging task might encourage tactile sensing without the requirement for training, making tactile whisker enrichment available to a wider group of species.