Man's underground best friend: domestic ferrets, unlike the wild forms, show evidence of dog-like social-cognitive skills.

Both domestic ferrets and dogs chose their owners (as opposed to the experimenter) significantly more often than expected by random selection (Wilcoxon Signed Rank Test; ferrets: T+ = 53.5, p = 0.004; dogs: T+ = 143.0, p<0.001), while the wild Mustela hybrid group displayed a marginally significant preference for the unfamiliar experimenter (T− = 38.0, p = 0.074) ( Figure 2 ).

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