A starling number of birds have become extinct over the last 400 to 500 years.Perhaps the most famous is the dodo.The moa lived in New Zealanf and looked like an ostrich.Gradually,it grew too heavy to fly. Thus, it become easy prey for hunters.The last specimens had been killed by the eighteenth century.The passsenger pigeon became extinct as late as 1914 when the last surviving bird died in an Ohio zoo