The term 'BIRD EXTINCT' refers to three extinct bird species: the DODO (4 letters), the MOA (3 letters), and the Archaeopteryx (13 letters). The DODO was a flightless bird native to the island of Mauritius in the Indian Ocean, and it became extinct in the late 17th century due to human activity. The MOA was a giant, flightless bird native to New Zealand, and it became extinct in the late 19th century due to human activity. The Archaeopteryx was an ancient bird species that lived during the Jurassic period, and it is considered to be the earliest known bird species.