TV adventurer Bear Grylls should be prosecuted for animal cruelty, a charity has said, after a tame pig was slaughtered and eaten by contestants on his show. A scene in Channel 4's The Island showed a group of hungry women capture an apparently sleeping pig and dispatch it with a knife.It was the third pig slaughtered on the show in two weeks. In an earlier episode two piglets were killed for food after they fell ill.Producers of the show admitted the animals were tame and had been shipped to the remote island for contestants to hunt and eat.But animal rights charity Peta said Grylls should be arrested for cruelty to animals along with the producers of the show, which is filmed on an island off Panama.A Peta spokesman said: "Killing animals is a cheap ratings ploy and sends a harmful message to young viewers, who are greatly influenced by what they see on TV."Bear Grylls and the producers should be prosecuted. Fame doesn't mean immunity."The RSPCA accused Channel 4 of killing pigs for entertainment.A spokesman said: "The RSPCA opposes practices that cause animals pain, suffering or death in the name of entertainment."Channel 4 said contestants had been "trained in the humane capture and dispatch of animals". ..