Extinct flightless birds are a group of birds that have gone extinct due to human activity. The two most well-known extinct flightless birds are the Dodo and the Moa. The Dodo was a large, flightless bird native to the island of Mauritius in the Indian Ocean. It was hunted to extinction by the end of the 17th century. The Moa was a giant, flightless bird native to New Zealand. It was hunted to extinction by the early 16th century. Both species were unable to fly and were easy targets for hunters.