Another photographic error

I have searched for other photographs that may have been used by the designer of the PNG Rare Birds issue, and found most of them.

I could not find one for the Slaty-backed Goshawk, and the image on the stamp is not like any illustrations I could find of the species. It looks more like a Eurasian Sparrowhawk (Accipiter nisus), but without finding the source photograph, I will list it as unidentified.

The stamp titled "New Britain Goshawk (Accipiter princeps)" is based on this photograph of Grey Goshawk (Accipiter novaehollandiae).

I have delayed publishing these observations for fear of causing the issue to be cancelled.