Migratory fuelling in blackcaps [Sylvia atricapilla)under perceived risk of predation

It has been argued that the body mass levels achieved by birds are determined by the trade-off be-tween risks of starvation and predation. Birds have also been found to reduce body mass in response to an increased predation risk.

Thord Fransson Thomas P. Weber, Behav Ecol Sociobiol (1997) 41: 75-80