Birds are the world's greatest flyers - but how do they do it? Dominic Couzens reveals the strikingly different flying skills of these ultimate aviators, from ocean-going albatrosses to your garden's great tits.The best natural-history puzzles are often those close at hand. To experience one of the most enduring, simply step outside into a garden or open space. Find a small bird, such as a great tit or chaffinch, and watch it fly. You've probably already noticed that, whenever a songbird flies without undue haste, it doesn't fly on a level plane from one spot to another, but instead undulates, as if g a series of small, invisible hills. But why?
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