Banko, Winston E.2007-12-202007-12-201980-06Banko WE. 1980. History of endemic Hawaiian birds: part I: population histories, species accounts: forest birds: Hawaiian hawk ('Io). Honolulu (HI): Cooperative National Park Resources Studies Unit, University of Hawaii at Manoa, Department of Botany. CPSU/UH Avian History Report, 6a.http://hdl.handle.net/10125/345Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.Buteo solitarius is a medium-sized, light to dark brown, broad-winged hawk endemic to the island of Hawai'i. The hawk has been recorded by many observers at high and low elevations in all major districts of Hawai'i from 1778 through the present. Distributional records are shown by U.S. Geological Survey quadrangle. References and names of observers are cited. Completeness of data, bias, erroneous and doubtful records are addressed. Findings are summarized. It is suggested that a long-term population decline is occurring. Except for Hawaii Volcanoes National Park, where specific long-term census data have been collected, there is yet no factual basis from which the overall population size or future trend may be estimated. More information on the home range, life requirements, and population ecology of the 'Io is needed.Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.en-USButeo solitariusIoHawaiian hawk.Hawks.Endemic birds -- Hawaii -- History.Forest birds -- Hawaii.Bird populations -- Hawaii.Rare birds -- Hawaii.Endangered species -- Hawaii.Report