The question is 'isabelline or red-tailed shrike' you see, not only do sabellinus and phoenicuroides are structurally and physiologically closely related but they share genetic characteristics too!
Both species have similar moult patterns, breed later and have longer migrations than the eastern races, and as one might expect show a longer wing, second primary and primary projections.
Shoulder to shoulder with dozens of birders and toggers right up against the wooden fence, where the bird showed well at first in the dappled light of the leaflitter, before moving into the taller grass and between the trees.
Another bird that you would expect to see on Shetland in November is OBP, a long-distance migrant moving in winter to southern Asia and Indonesia with a few overshooting and this bird finding its way to a caravan park in Thornwick Bay, Flamborough. Whats next? Whatever it is I hope I can move quickly enough to see it.