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Dogs pick out faces of other dogs, irrespective of breeds, among human and other domestic and wild animal faces and can group them into a category of their own. They do that using visual cues alone, according to new research by Dr. Dominique Autier-Dérian from the LEEC and National Veterinary School in Lyon in France and colleagues. Their work, the first to test dogs' ability to discriminate between species and form a "dog" category in spite of the huge variability within the dog species, is published online in Springer's journal Animal Cognition.