Ключевые слова: air resistance, array, ascending currents, beaks, big, birds, blue, circulate, climb, cooperation, coordination, direction, effort, eilat, feathers, fish, flight, fly, fly in the key, great white pelican, heat, heated air, herd, huge, interesting, israel, migration, minimization, piscivorous, range, red sea, sky, spring migration, sunny, system, thermal chimneys, type, wings,