First breeding of the Willow Warbler in Bulgaria. - D.N. Nankinov, N.D. Nankinov. - Berkut. 7 (1-2). 1998. - P. 134-135.
The south border of breeding range of the species passes to the north from the territory of Bulgaria. A nest with 6 eggs was found in the mountain of Ljulin, to the west from the city of Sofia, in 1996. One of the reasons for the breeding of the Willow Warbler in Bulgaria can be the cold and rainy spring of 1996. The unfavourable weather conditions have made some of the migrating birds to settle for nesting in more southern regions. The bad weather has been the reason for building the nest on a slope, where the rain water does not stay but quickly drains away, and also for the late breeding time of the couple. [English].
Key words: Willow warbler, Phylloscopus trochilus, Bulgaria, distribution, breeding, nest.
Address: D.N. Nankinov, Institut of Zoology, Boul. Tsar Osvoboditel 1, 1000 Sofia, Bulgaria.