Zoos often try to craft their enclosures to resemble animals' natural habitats, but even the coziest confines of captivity can't compete with the feeling of being free.

Five plucky little penguins at the Odense Zoo in Denmark were recently caught in the act of trying to make a break for it. Unfortunately, their bid for freedom was thwarted when the birds' keeper was alerted to their escape attempt after spotting their hurried little footprints in the frosty enclosure floor - leading to their discovery in a corridor in the back.