Seabirds’ morphology (physical traits) and behavior, are the their forks and knives. Their environment, however, sets the menu. So while murres are equipped to eat schooling fish and crustaceans, their physical and biological surroundings determine which particular one they pursue. Winds and water temperatures can change their diet, but so can the effects of overfishing. Because of those relationships, the food choices seabirds make can actually tell us a huge amount about the health of our oceans.