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...from a look at your photos the birds you can see the peachy flanks which contrast nicely with the more whitish central belly and yellow undertail coverts. The bird also shows a greyish band on the upper chest and a large amount of bright yellow in the loral area (between eye and bill), and contrasting thin loral line. Also notable is the slim, slight looking build - Orange-river is generally a smaller, slimmer bird than Cape White-eye. When you see them again, take a listen to the call-notes, that of the Orange River White-eye are lower-pitched and "flatter" (more chattery) than those of Cape White-eye and are really quite different.

It is important to mention that Standerton is by no means that far from the known range of Orange-River White-eye. Orange River White-eye is a relatively new split and the distribution maps are still work in progress: to quote Roberts VII.... "widespread in Orange and Vaal R catchments,.... In S Africa, some eastward range expansion suspected."

While we need to treat recent records and reports with caution, I believe that this species is regular on the Vaal river near Parys, but is not infrequently recorded further east, and there are quite a few records from the Balfour area and a few from Suikerbosrand Nature reserve near Heidelberg. Given that it's habitat is often riverine bush and scrub, it is used to extending it's range along rivers, so I am not that surprised that it has showed up in Standerton, particularly that in a time of drought, such as now, we can expect many species to extend their ranges eastwards, as has been the case with species like Grey-backed Sparrowlark, Lark-Like Bunting etc.

While we need to treat recent records and reports with caution, I believe that this species is regular on the Vaal river near Parys, but is not infrequently recorded further east, and there are quite a few records from the Balfour area and a few from Suikerbosrand Nature reserve near Heidelberg. Given that it's habitat is often riverine bush and scrub, it is used to extending it's range along rivers, so I am not that surprised that it has showed up in Standerton, particularly that in a time of drought, such as now, we can expect many species to extend their ranges eastwards, as has been the case with species like Grey-backed Sparrowlark, Lark-Like Bunting etc.

Your Standerton record is indeed interesting and does, in my opnion, represent a notable range extension / vagrancy for the ORWE.

The two (white-eye) species are easily told apart on calls - particularly the loud contact call, which is what one would hear mostly at this time of year (i.e. males are not uttering their breeding season songs now). I describe the ORWE contact call as an urgent, clipped "pirri, pirri, pirri, pirri", compared to the more flutey, musical, somewhat longer "tyoouu, tyoouu, tyoouu, tyoouu" calls of the Cape White-eye. This is how I know that Cape White-eyes (grey-bellied birds) are around in the garden here, from June to about September (they seem to arrive at the time when exotic Cotoneaster bushes are in fruit, with their small red berries, on which the birds feed).

Since that first time that the ORWE visited the feeding station I have seen both the other white-eyes (virens virens and virens capensis) at the feeding station simultaneously. The ORWE visited on a few occasions too (with a mate), but never in the company of the Cape white-eyes.