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The crow stands on the eagle's back to rest, that is, taking the eagle as a reference. The position of the crow relative to the eagle has not changed, so the crow is still;

When an eagle flies, the air above its wings has a high speed and a low pressure, while the air below its wings has a low speed and a high pressure, so at this time, its wings are subjected to an upward resultant force, thus gaining lift.

So the answer is: eagle; ? It's huge.