Menzel did several experiments to answer these questions. First, he gave individual bees a single sugar reward on a colored background. He then kept these bees in small cages for several days without any further trials. After a few days, he presented each bee with an array of several dishes, each on a different colored background. One of the colors was the same as that used during the initial trial, and the others were novel, unrewarded colors. Remarkably, after a single trial and several days without exposure to the rewarded color, bees correctly chose to explore the color used in the first trial more than fifty-percent of the time.