Kona Grosbeak

Kona Grosbeak

Kona Grosbeak

Names 

  • Common Name:  Kona Grosbeak 
  • Scientific:  Chloridops kona 

Song 

No available recordings.

Conservation Status 

Extinct. Last recorded sighting in 1892.

Species Information 

The Kona grosbeak, lesser koa-finch and greater koa-finch are similar species due to their size, habitats, and brief documented history. The main differences between these honeycreepers are their beaks and colors. The Kona grosbeak was a medium-sized, olive-colored forest bird in the Chloridops genus. Kona grosbeak were unique to this family because of their large heads, muscular jaws, and strong beaks, adapted for breaking through and eating hard naio seeds (Olson 1999). Due to this adaptation and choice of food source, their stomachs are smaller than the lesser and greater koa-finches who primarily eat and store koa seeds (Olson 1999).

Distribution 

Hawaiʻi Island  

Habitat 

In addition to the dry, middle elevation, mesic forests found in North Kona, Kona Grosbeak would have been found habituating recent ‘a’a lava, due to the prevalent sandalwood (Olson 1999).  Records of this species come from Hualalai and Mauna Loa, near Puʻu Lehua Ranch and Kaʻohe Ranch (Pyle & Pyle 2017).

Threats 

Due to their brief history, the cause of extinction is unclear. However, these birds consumed one specific type of food in a niche habitat, so the assumption is that as the terrain changes with an increase in human populations, the birds could not adapt. These changes include factors such as deforestation and introduced species (Grant 1995). The discovery and disappearance of this bird happened almost simultaneously with the Kona grosbeak and greater koa-finch (Olson 1999). 

Photos  

Kona grosbeakKona grosbeak. Jeremy Snell, courtesy of Bernice Pauahi Bishop Museum
Kona grosbeakKona grosbeak. Jeremy Snell, courtesy of Bernice Pauahi Bishop Museum
Kona grosbeakJeremy Snell, courtesy of Bernice Pauahi Bishop Museum
Kona grosbeakKona grosbeak. Jeremy Snell, courtesy of Bernice Pauahi Bishop Museum

Additional Resources 

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)

Grant, P. R. 1995. In remembrance: Cliloridops kona, died ca. 1895. The Linnean, Newsletter and Proc. Linn. Soc. Lond, 11(13): 14-23 

Olson, S. L. (1999). Kona Grosbeak (Chloridops kona), Greater Koa-finch (Rhodacanthis palmeri), Lesser Koa-finch (Rhodacanthis flaviceps). The birds of North America.