Formerly known as Hawaiian Gallinule, this subspecies is endemic to the Hawaiian Islands. In Hawaiian mythology this bird brought fire to mankind, scorching its forehead red. This subspecies is characterized by having a large frontal shield and reddish leg "garters" as seen here. Formerly established on all the main islands, they are now confined to Kauai and Oahu. With a total world population of about 500, this subspecies is listed as endangered. Habitat loss and pressure from introduced Mongoose have been suggested as possible causes of their decline. This species was recently split from the Common Moorhen (Gallinula chloropus) of Eurasia which has its frontal shield more rounded and widest in the middle instead of truncate and widest at the top. Also the two have distinctly different vocalizations. Canon PowerShot SX60 HS.
References:
Bannor, B. K. and E. Kiviat (2002). Common Gallinule (Gallinula galeata), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bna.685
del Hoyo, J., Collar, N., Christie, D.A. & Kirwan, G.M. (2020). Common Gallinule (Gallinula galeata). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from https://www.hbw.com/node/467254 on 26 January 2020).
Pyle, R.L., and P. Pyle. 2017. The Birds of the Hawaiian Islands: Occurrence, History, Distribution, and Status. B.P. Bishop Museum, Honolulu, HI, U.S.A. Version 2 (1 January 2017) http://hbs.bishopmuseum.org/birds/rlp-monograph/