sentences:  In East Thrace, Turkey, the second most regularly taken prey species is the yellow-legged gull ("Larus michahellis"), which comprised more than 12% of the diet by number and 13.8% of the prey biomass.Additionally in East Thrace, a high volume of white storks ("Ciconia ciconia") was taken, making up 11.3% of the biomass.In Bulgaria, similar prey were important secondary foods, i.e.