Black-headed gull temporarily stopping in the air or the landing point

�@A black�]headed gull flaps up the wing to right above, twists the wrist to backward, and flaps down with vigor. Then the tail is fully opened. Such an action is somewhat similar to that in the emergency takeoff, and the drag on the wing has been used. It may be said the emergent temporal stop.
�@I have been impressed in the action that a large flock of black-headed gull fly up in the sky by riding on a thermal ascending current appeared River Kamo and they return to the roost in Lake Biwa over the eastern mountains at evening in winter. It is the same as the demoiselle cranes migrate over the Himalayas. �@(Prod. Jun. 2008, scale 1/2, No.1)

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