Part of teamwork is establishing trust and helping one another. Clear the room of all obstacles except for one chair, which you should place in the middle of the room. Have the class sit in a large circle around the chair. Blindfold one student volunteer, who must try to find his way to the chair. If he can't do it, have another student guide him to the chair. Give each student a turn.
Teamwork can help preschoolers accomplish large tasks very quickly. Tell the children that they must pretend to be ants. Place a number of balls at one end of the room, which represent pebbles blocking their anthill. Have students try one at a time to move all the "pebbles" to the other side of the room. Then, line all the students up and have them pass the balls along the line. Show them how quickly they can get into their anthill when they all work together. Other good group tasks involve having students solve a riddle together, do a giant puzzle or build a model out of blocks of their ideal city.
Sometimes, people have to rely on senses other than sight when they work together. Assemble your preschoolers in a circle. Have them close their eyes. Tell students they can be either a cow or a duck. On the count of three, students must stand up and begin either mooing or quacking. Still with their eyes closed, students must find a partner of the same species. Keep a close eye to make sure students don't bump into anything and hurt themselves. You can also pair students up, ask them to close their eyes and have them try to communicate with each other simply by touching. Other alternative communication teamwork ideas include playing charades or communicating an idea through drawing to the rest of the group.
Teamwork sometimes means working together to overcome difficult obstacles. Assemble two long pieces of cardboard, approximately 5 feet in length and 6 inches wide. Place them on the floor end to end, making a long "bridge." Have one student stand at each end of the bridge facing each other. Students must both cross the bridge to the other side without stepping off. Let students figure out how to work together to get around each other cooperatively. Alternatively, have the class try to keep a number of balloons in the air by hitting them. Keep adding more balloons as students work together to develop a system to make sure no balloon touches the ground.