Six three shews (Tupaia glis) were trained in a 2-choice visual discrimination test. The animals learned tasks with color differences more quickly than those with form differences; however, they could not retain simultaneously more than 2 to 3 tasks. The main reason was that they were incapable of remembering tasks for a long period of time; the number of days necessary to learn black-and-white patterns was only a little smaller than the number of days such patterns were remembered. Color tasks were remembered longer than black-and-white tasks. The color stimuli were discriminated more on the basis of their brightness than their hue.