"The number of wild boars in Collserola Park has grown too big to sustain itself. Environmentalists estimate that about 500 of them forage for roots, plants, insects and tiny prey in the wooded mountains at the edge of Barcelona. They also sometimes wind up in the city itself, scavenging for food in trash containers." http://www.independent.co.uk/environment/nature/the-boar-war-barcelona-aims-to-control-its-wildlife-2211242.html