AVOCETTA - VOLUME 16 - N. 2
Status and migration of the Siender-billed Gull (Larus genei) in BulgariaNANKINOV D.N.
Abstract:The earliest Slender-billed Gulls arrive in Bulgaria after July 5. Some 72.70/0 migrate to the Mediterranean in August-October. A tiny number, 1.0 to 2.2% of the birds spend the winter and spring in Bulgaria. The Black Sea is the spring flight route. Nesting by the Slender-billed Gull may be expected in Lake Atanassovsko.