The B.A.N.Z. Antarctic Expedition: official original photograph by Captain Frank Hurley:Image A25 - title: penguins that hop like kangaroos,with official 'Mawson Antarctic Expedition' handstamp and release date 'Tuesday Apr. 15, 1930' verso, together with the official letterhead, title, and details of the image, 'A colony of 'Rockhoppers' on a Cliff edge 200 feet above the sea at Heard Island...',20 x 26 cm.