There are 18 different species of penguin, but only two species truly make the Antarctic their home by living and breeding there- the Emperor penguin and these guys, the Adélies.
Male Adélies are nest builders, and their aim is to attract a female by building the biggest and best nest. To do this they use small rocks; if they think their nest is lacking in the shiniest of rocks, the cheeky little Adélie will steal from their neighbour’s nest.