red fish, blue fish

Yesterday, I had the kids color fish for a venn diagram activity. They could only use their red and blue crayons. After they cut their fish out, I told them we had to group our fish on the diagram. I asked them what fish we should put in the red circle, what fish should we put in the blue circle and what fish should we put in the middle? They did this activity two or three times. For the second time, we turned the fish over and they "fished" one and placed it in the corresponding circle.