The students are transformed into the food web animals by clipping the pictures to their front collars. A slip of paper is also attached to record 'deaths' and students carry a pencil each. Keep blowing the whistle every 2 minutes to indicate the end of a feeding period. If they cannot feed in the two minutes they die. When all five lives are used up the animal must leave the game and stand out.
Animals die when touched by a predator.
The teacher could represent a hunter, poacher, fishing boat etc. The end of the game is indicated by two whistle blasts in succession. Undertake a trial run of 6 minutes. Check for any questions then play for 10 minutes. Stop and change roles and play for another 10 minutes.