Birds migrate long stretches - sometimes even thousands of miles between its breeding and non-breeding ground - a journey _____________ many hiccups - often perilous - but it doesn't have the luxury to reproduce and blossom in a fixed habitat. It has to fly to a new spot - sometimes_____________ food - some other times to escape harsh winters - the reasoning the same each time-the desire to survive. Migration as a phenomenon is nature's remarkable way of _____________ Darwin's theory-'Survival of the fittest'; the Syrian migrants _____________ the theory even more vehemently.