Nils Olav the Penguin inspects the Kings Guard of Norway after being bestowed with a knighthood at Edinburgh Zoo

World of Animals: The colonel-in-chief of the Norwegian Royal Guard is a penguin

Sir Nils Olav has been an honorary member since 1972

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    World of Animals Crocodile

    World of Animals: Crocodiles can go for years without eating anything

    Believe it or not, these fierce carnivores can survive for ages without a meal