There are two migrant races of Orange-headed Thrush (Geokichla citrina) to Peninsular Malaysia.
HBW (2020) says G. c. innotata and G. c. gibsonhilli.
Wells (2007) says G. c. innotata and G. c. citrina (including gibsonhilli,).
- G. c. innotata is said to be “richer orange with no white wing-bar” (Wells 2007, HBW 2020). G. c. citrina and gibsonhilli have a white wing-bar. G. c. gibsonhilli is said to be heavier-billed than the nominate.
How much of a white wing bar is sufficient to call it G. c. citrina/gibsonhilli as opposed to G. c. innotata? In addition there is the issue of first year birds and moulting.
Post 1 is of a bird I am certain is G. c. innotata. It has no white in the wing (no white wing bar); I have a number of images in different view to be sure of this.
Post 2 & 3 are of different birds, in different lighting, that have some degree of a white wing-bar but not as strong as expected. Do we call these birds G. c. citrina/gibsonhilli?
Wells (2007) states that intergrades are “quite common”. So I guess we should call these G. c. gibsonhilli-innotata intergrades.
Post 4 is the same bird as in Post 2 (an intergrade).
Note that one site states that “Subspecies gibsonhilli looks similar but has white median covert tips (wingbar) and blackish line across eyes and behind ear-coverts”. But I cannot find this in other text. (https://singaporebirds.com/species/orange-headed-thrush/)
Amar-Singh HSS (Dato’ Dr) – Ipoh, Perak, Malaysia
Location: Taiping, Perak, Malaysia
Habitat: Primary jungle at foothills
Date: 14th February 2020
Equipment: Equipment: Nikon D500 SLR with Nikon AF-S Nikkor 500mm f/5.6E PF ED VR, handheld with Rode VideoMic Pro Plus Shotgun Microphone