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Coyotes can do ‘puppy dog eyes’ too: comparing interspecific variation in Canis facial expression muscles
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Coyotes can do ‘puppy dog eyes’ too: comparing interspecific variation in Canis facial expression muscles
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Coyotes can do ‘puppy dog eyes’ too: comparing interspecific variation in Canis facial expression muscles
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Journal Article
Coyotes can do ‘puppy dog eyes’ too: comparing interspecific variation in Canis facial expression muscles
2024
Overview
Facial expressions are critical for non-verbal communication. The Canis genus epitomizes the interplay between behaviour and morphology in the evolution of non-verbal communication. Recent work suggests that the levator anguli oculi medialis (LAOM) muscle is unique to dogs ( Canis familiaris ) within the Canis genus and evolved due to domestication. The LAOM raises the inner eyebrows, resulting in the ‘puppy dog eyes’ expression. Here, we test whether the LAOM is a derived trait in dogs by (i) examining the facial expression muscles of a closely related and ancestral wild Canis species, the coyote ( C. latrans ) and (ii) comparing our results with other Canis and canid taxa. We discover that coyotes have a well-developed LAOM like dogs, which differs from the modified/absent LAOM in grey wolves. Our findings challenge the hypothesis that the LAOM developed due to domestication. We suggest that the LAOM is a basal trait that was lost in grey wolves. Additionally, we find inter- and intraspecific variations in the size of the muscles of the outer ear, forehead, lips and rostrum, indicating potential adaptations related to sensory perception, communication and individual-level functional variations within canids. Together, this research expands our knowledge of facial expressions, their evolution and their role in communication.
