The Kauai oo, Moho braccatus, which is believed to have become extinct in the late 1980s.
1930s; earliest use found in Webster's New International Dictionary of the English Language. From Hawaiian ʽōʽō-ʽāʽā Kauai oo from ʽōʽō + ‘ā‘ā dwarf.
Are You Learning English? Here Are Our Top English Tips