This video from Georgia says about itself:
Honey Buzzard migration, Batumi 2013-09-03
A short film of migrating Honey Buzzards in Batumi. The bottleneck of Batumi is probably one of the best places to be if you wanna see a lot of migrating raptors. In early september, the peak time of honey buzzards occurs and thousands of Honey Buzzards migrate.
However, there are always other days, better than good days.