Students study the food relationships found in a temperate forest. This is a card game with several variations: Predator (timed version), Green World Game, Solitaire, Concentration, and Rummy. 
Includes a deck of 40 cards and instructions. 

Approximate playing time is 15 to 30 minutes. 
For 4 to 40 players (6 or fewer is best), age 10 to adult.