First, the young whale spit regurgitated fish onto the surface of the water, then sank below the water and waited. If a hungry gull landed on the water, the whale would surge up to the surface, sometimes catching a free meal of his own.
Noonan watched as the same whale set the same trap again and again. Within a few months, the whale’s younger half brother adopted the practice. Eventually the behavior spread and now five Marineland whales supplement their diet with fresh fowl, the scientist said.