Subject: Why would it be useful to know of tortoises or turtles can recognize colors

I conducted an experiement with my Russian tortoises to see if they could 
recognize colors using different colors of food dishes.  I concluded that they 
could, as they selected the color of their familar food dish 75% of the time.  
I would like to know how or why this experiment was useful, but I can't think 
of any reason and neither can my parents.  Because the tortoises were more or 
less trained to recognize the color of their food dish, recognizing colors 
would not be helpful in marking danger areas in nature with certain colors.

Re: Why would it be useful to know of tortoises or turtles can recognize colors