The closer the bird is to the surface of the water, the firmer and more inelastic is the uplift of the rising air. The bird appears to almost feel the surface with the tip of its weather wing. (Lawrence Hargrave)

The closer the bird is to the surface of the water, the firmer and more inelastic is the uplift of the rising air. The bird appears to almost feel the surface with the tip of its weather wing.

Lawrence Hargrave

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air almost bird closer rising surface tip uplift water weather wing firmer

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