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The Collared Flycatcher (Ficedula albicollis) is an Old World flycatcher in the family Muscicapidae. It is a summer resident in central/eastern Europe and south western Asia. This species occurs in well-established deciduous woodland as well as parks and gardens where old woodpecker nesting holes are readily used. In late April/May, it returns from its wintering areas in southern Africa. Main prey items include caterpillars and small flying invertebrates. By September with its food supply in decline, the return migration south begins.
Reference: Patrick J. O'Keeffe / Raw Birds