sentences:  In studies of two different areas of Bulgaria, one showed European hares as the main prey (25%) in the Dervent heights and southern white-breasted hedgehog ("Erinaceus concolor") (32.5%) in the other, Saker mountain.In East Thrace, Turkey, the same hedgehog was the most important prey, comprising 23.1% of 582 prey items and 21.2% of the prey biomass.In warmer, southerly areas, the primary prey species seem to generally be smaller.