The document summarizes the extinction of two flightless bird species - the dodo bird and the great auk. It describes that the dodo bird lived on Mauritius off Africa and became extinct in the 17th century due to being hunted by sailors as an easy food source. It also describes that the great auk lived in the North Atlantic and was also hunted by sailors and fishermen for its eggs, feathers, and skin over 100,000 years until the last known birds were killed in 1835. Both species were flightless and faced extinction shortly after human contact due to being hunted as easy prey with no natural predators.