Do you ever wish you could fly? Well, like birds, you would have to have hollow bones and feathers because that is what enables most birds to fly - although there are flightless birds that exist. There are approximately 9,000 bird species in the world: the fastest flyer is the Spine-tailed Swift which can fly along a straight path at more than 100mph - and the bird with the longest wingspan is the Wandering albatross which has a wingspan of 12 feet!
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