The Red-breasted Flycatcher has a large and stable global population widespread through much of the Western Palearctic. Contrarily, however, it is a very scarce breeding bird in the forested montane habitats of Hungary. The few pairs breeding here represent a peripheral population on the very edge of the species' geographic area. This peripheral population declined considerably (from 3–500 to 100 pairs) during the past decades likely due to the degradation of suitable habitat patches including

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... he loss of appropriate nesting sites. To reverse this trend, we applied a new type of artificial nestbox developed specifically for this species. Occupancy rate was very low and breeding success was also low unless applying a protective wire mesh to reduce predation pressure.