Each year millions of Palaearctic breeding songbirds migrate from Iran to Afro-tropical wintering grounds. Due to many recoveries of ringed birds the principal migratory routes for some species are fairly well-known. Despite this basic information, little is known about the detailed spatial and temporal course of migration as well as the detailed analysis of environmental factors in the control of avian migration especially in Iran.
Flying is an energetically expensive activity. Successful migration depends on the storage of energy fuel for the migratory flights. The principal fuel for migratory flights in birds is fat. To fuel flights between successive sites along the migratory route many migrants must store large amounts of fat as energy before departure. For the Palaearctic migrants wintering in tropical Africa, an appropriate fuelling is essential before they are leaving for their trans-Saharan journey.
Where and when Palaearctic migrant songbirds energetically prepare for migration, however, is not well known. It may depend on the strategies used by various species to cover their long migratory distances. We at birdsofiran.com are working on such unknown areas of migration of song birds to disclose such data for future researches.