(Regulus ignicapilla)Category of conservation concern (IUCN, 2020) - Least Concern Population size: 10 000 - 40 000 pairs Distribution pattern With patchy distribution favouring the coniferous belt of the Rila-Rhodope Massif, Vitosha, Western and Central Stara...
(Turdus pilaris)Category of conservation concern (IUCN, 2020) - Least Concern Population size: 0 - 5 pairs Distribution pattern Extremely rare, probably irregularly nesting species. Recorded as breeding species only once in Bulgaria. On June 14-21, 1993, a nest with...
(Mareca penelope)Category of conservation concern (IUCN, 2020) - Least Concern Population size: 0 pairs Distribution pattern Isolated sites during the breeding season on the Danube River, in the Mandra Lake, along the Maritsa River and Iskar River. All observations...
(Aythya nyroca)Category of conservation concern (IUCN, 2020) – Near threatened Population size: 2020: 147 – 466 pairs (2007: 150 - 230 pairs) Distribution pattern Grouped and dispersed, mainly along the River Danube and the neighbouring areas of the Danubian Plain,...
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