I heard a radio show recently where the host mentioned a study in the 50's where people were asked what rabbits and dogs had in common, and the answers were usu

I heard a radio show recently where the host mentioned a study in the 50's where people were asked what rabbits and dogs had in common, and the answers were usually something along the line of "they both have two ears". The same question was asked some time in the 2000's and the more common answers relied on abstraction like " they are both mammals". I'm not sure if that is reflective of a shift in "intelligence" but I do think it's a shift in thinking.