We already mentioned at our web-pages, that migration intensity of birds of prey significantly differs for various regions of Ukraine. However, numbers of migrating raptors can be also greatly impacted by weather conditions, forming migration waves. It is the phenomenon which we observed in mid-October 2011.
MIGRATION OF BIRDS OF PREY ALONG KYIV RESERVOIR
15 and 16.10.2011 we observed migration of birds of prey at one of our observation stations located to the north from the village Lebedivka (Vyshhorod district of Kyiv region) at the shore of Kyiv Reservoir. On 15 October it rained until 11 a.m., alternated with hail. Only when it stopped and the sky was getting clear, we saw single Buzzards and their pairs. Gradually, the number of birds in groups became higher, and in the afternoon the sky was full of migrating raptors.
At first, bird groups flew to the south-west, then to the south and to the end of the day the migration mass of raptors were moving to the east and south-east. The birds, which chose the latter direction, flew from the reservoir; we saw about 400 of them and for many years of observations we recorded such direction of passage for the first time. One of Buzzard’s flocks included 212 birds. Big flocks of these birds stretched for several kilometres.
We intentionally selected this territory to study migration of birds of prey. A vast area of the reservoir stretched from the north to the south makes migrating birds to keep to the left bank during their autumn passage. Thus, raptors fly around the water obstacle and form a narrow stream of migrants. Besides, after the cold spell numerous birds actively left northern territories.
Information Letter No1
We would like to invite you to take part in the 4th International Ornithological Conference on Birds of Prey and Owls in North Eurasia:
BIRDS OF PREY IN THE DYNAMIC ENVIRONMENT
OF THE THIRD MILLENIUM:
STATUS AND PROSPECTS