The sea urchin Centrostephanus sp. changed the timing of foraging from asynchronous to nocturnal in the presence of the predatory wrasse Pimelometopon sp. ( Nelson and Vance, 1979). Lima and Bednekoff (1999) formulated their risk-allocation hypothesis based on the idea that different threat levels will result in different responses by the prey. They stated that an infrequent, high-risk predator interaction should result in stronger responses by the prey then more frequent ones.Lima and Bednekoff (1999) formulated their risk-allocation hypothesis based on the idea that different threat levels will result in different responses by the prey. They stated that an infrequent, high-risk predator interaction should result in stronger responses by the prey then more frequent ones.