A grey reef shark swims inside a tank in the Madrid's Zoo Aquarium
A grey reef shark (Carcharhinus amblyrhynchos) swims inside a tank during a presentation of the European Shark Week in the Madrid's Zoo Aquarium October 14, 2011. Members of the Shark Alliance in Europe run a week of activities demanding that policy makers secure the future health of shark populations. REUTERS/Andrea Comas (SPAIN - Tags: ANIMALS)
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