"Sea Otters, Mussels, and Humans," is all about acting out each of the three and determining which poses a threat to which in nature. The way we play this game, Mussels pose a threat to Humans because due to pollution in the ocean, polluted Mussels are actually harmful to Humans. Since Humans hunt Sea Otters, Humans in the game pose a threat to the Sea Otters. Since Sea Otters eat Mussels, in the game, Sea Otters pose a threat to Mussels.