Abstract
<p>The results of the preliminary analysis carried out by <em>Flight</em> software for White Stork and Pelican that migrate within the Mediterranean-Black Sea Migratory Route were presented. Obtained results practically coincide with experimental results and data of radar observations. Optimum speed allows the birds to fly with a higher grade soaring and shorter distance between the thermal flows. Time to find the next effective thermals (thermal flux) is reduced by increasing the speed, which in turn reduces the average rise in thermal flows, increases the risk not to find appropriate thermal. Soaring birds reduce wingspan and wing area by bending the joints of the extremities at high speeds. This reduces profile resistance and increases the inductive reactance. Profile resistance increases and the inductive reactance decreases with increasing of bird speed. Under ideal conditions the birds try to find a position of wingspan, which reduces the difference between the values of profile and inductive resistance.</p> <p><em>Key words: Flight software, migration, birds, energetic parameters, prognosis, modeling.</em></p>
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