“When I first saw this White-breasted Waterhen (Amaurornis phoenicurus phoenicurus) I thought it might be injured with wing damage. But on closer inspection the wing changes were bilateral and fairly uniform. I considered some form of disease with feather loss but the bird looked otherwise healthy and had come out to get some sun. I suspect this is the wing moult of the adult bird but then again I have not seen it before (seen large numbers of waterhens over the years).
“I am not able to find any information on moulting in adults waterhens and appreciate views/sources. Some of the Rallidae are known to have a wing moult and be flightless for 2-3 weeks. Perhaps this renders the bird vulnerable and hence rarely seen?
“More images on request.”
Dato’ Dr Amar-Singh HSS
Ipoh, Perak, Malaysia
15th October 2017
Location: Tambun, Ipoh, Perak, Malaysia
Habitat: Secondary growth near limestone hills