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The shadow is there, but it is 'diluted' until practical invisibleness; spreading over a very big area and proportionally becoming lighter. Projection is a keyword here:

The shadow is projected unto the nearest surface. If it is very close, the shadow is very dark. But there is only that much 'darkness' in a shadow. If the object is moved farther from the surface (e.g. the bird flying higher) the shadow becomes bigger, but less dense. The shadow is diluted until invisibleness, the smaller the rising bird, the faster. Try throwing an object up in the air in sunshine and see the effect.

This explanation is true, but get a physics teacher explain it more scientifically correct.

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13y ago

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