Birds are flying by flapping their wings up and down as well as forward through the air. Vertical motion of the wing is greatest farther away from the body.Closer to the body, wing movement is primarily horizontal.
Apart from that, birds have a number of other body specifics allowing an easy flight: empty tube bones, quick metabolism without agglomeration of fecal masses.
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
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