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You do, but it depends on the bird.When a bird is using thermals, or flying into headwinds in the manner of a kestrel, it is basically gliding, and so to do it efficiently, it must be a good glider, which means it needs to have a high aspect ratio wing (i.e. a very long wingspan in relation to its length from front to back). This is exactly the opposite configuration that would be desired to create high manoeuvrability or rapid take-off (for which you want short wings that can beat fast).Any bird can fly into wind, and can appear to hover in relation to the ground, but a bird with a high aspect ratio can do so with less wind than a bird with a lower aspect ratio wing. In gale force conditions, many birds can fly into wind and appear to hover.
Started by LeeE