In pictures: Penguins rock back to the zooPublished13 March 2013Shareclose panelShare pageCopy linkAbout sharingImage caption, Penguins Rock, the revamped outdoor penguin pool at Edinburgh Zoo, is to reopen to the public on ThursdayImage caption, The zoo's penguins have been reintroduced to the pool over the past few weeks and have started to use the new facilities, such as the diving boardImage caption, Edinburgh Zoo retained 29 gentoo penguins which had been staying in Belfast and Denmark while the enclosure was shutImage caption, The new enclosure has mock sandy beaches and rocky areasImage caption, The pool contains about 1.2 million litres of water, about half as much as an Olympic size swimming poolImage caption, Lowered sightlines, glass barriers and wood perimeters should make it a better viewing experience, the zoo says. All pictures taken by Ivon Bartholomew