Dogs' eyebrow anatomy is the latest example of how 20,000 years of cohabitation has made our pets finely tuned interpreters of human emotion
Kaminski and colleagues dissected and analyzed the facial muscles of six dogs—including a mongrel, a Labrador retriever, a bloodhound, a Siberian husky, a Chihuahua, and a German shepherd—as well as four wildThe team discovered the levator anguli oculi medialis, a large and prominent muscle, in all six dog specimens—but it was almost completely absent in wolves.
Kaminski and colleagues also found that the retractor anguli oculi lateralis muscle was smaller and more variable in size and presence in wolves than it was in dogs, with the exception of the Siberian husky, a more ancient dog breed that's closely related to the wolf. This muscle, which runs along the eye’s outer edge, exposes more of the white of the eye—making the dogs appear human-like., a Ph.D. student who studies evolution and dog domestication at the University of Florida."The muscles of facial expression are relatively tiny muscles, but they can make a big impact on the way we perceive a face," says Selba, who wasn't involved in the research.Please be respectful of copyright. Unauthorized use is prohibited.
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