At one pool, where a couple of bird scientists happened to be watching, a herring gull arrived, rushed into the gang of mallards, grabbed a piece of bread, swam a few feet away towards the middle of the pool and then started to lift and drop the bread into the water. Each time, the bread broke into smaller pieces. Once he had scattered it into perfect crumbs, the gull stayed there waiting, as still as glass, neck out, head down, looking intently at the surface of the water. After a few seconds, the goldfish in the pool came up to nibble at the crumbs and the gull struck, about one in every two
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