It is great that you recommend "looking beyond the typical 'proportion consumed' for investigating multiple predator effects", and I agree. The shift in prey size consumed is striking. What is it about this prey item that prevents C. maenas from maintaining its full prey size distribution when shore crabs are present? Are larger mussels proportionately more difficult to crush than smaller mussels, so biomechanically it is not advantageous to concentrate on larger mussels when H. sanguineus is present ? Fig. 4 suggests that larger mussels have more than enough meat inside that they should be preferred if predators are able to consume them, particularly at the 5-6 cm size class.