Image Description from historic lecture booklet: "These are flightless birds, of moderate size. The wings are reduced in size and modified by the flattening and consolidation of the bones until the product is a perfect swimming paddle, for which purpose they are exclusively used. These birds are expert swimmers and divers, but unlike most other aquatic birds, they make no use of the feet in swimming beyond employing them as a rudder. They are, perhaps, most abundant in species in the vicinity of the Falkland Islands, but they are common about New Zealand and the west shore of Australia."