On the cruise boat taking us from Stockholm to Helsinki, we found many seagulls flying along and behind us. My wife took some bread crumbs and started throwing the crumbs at them.
At first I was a bit doubtful whether the seagulls could actually see those tiny bits of bread. But they had really sharp eyes and were amazingly agile. Not only could they spot the crumbs. They could keep their eyes on the bits, even when they were flying at high speed.
Often they had to twist their necks and even the whole body around, to keep the bread crumbs in sight, all the while keeping themselves afloat in mid-air. Amazing.
At first I was a bit doubtful whether the seagulls could actually see those tiny bits of bread. But they had really sharp eyes and were amazingly agile. Not only could they spot the crumbs. They could keep their eyes on the bits, even when they were flying at high speed. 
Often they had to twist their necks and even the whole body around, to keep the bread crumbs in sight, all the while keeping themselves afloat in mid-air. Amazing. 
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