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This page is devoted to variation in American Robin (Turdus migratorius). The vast majority of birds fall within the range of limited variation described in most references:- eastern birds average darker, western paler; western birds normally have much-reduced white tail corners; a small number of the paler (presumed western) birds exhibit a pale supercilium plus more extensive white on the underparts that can narrowly divide the red belly and lower breast.
Here are some individuals that perhaps push the envelope a little further; all are from Fort Worth, Texas, and all but the first bird are digiscope images:-
1) Winter 1999: sadly I could not get a profile shot of this bird, as it had a striking supercilium that extended back beyond the rear of the auricular. It otherwise looked fairly normal - i.e.it was not a pale bird, thus demonstrating that the eyebrow effect can occur in normally-colored individuals:

2) Jan 13, 2003: This individual was normal in every other respect, other than the irregular supercilium present on both sides of the head - again showing that normal-color birds can have a prominent eyebrow:

3) Jan 13, 2003: This bird shows how the apparent supercilium can be exaggerated by a front-view. This individual has the palest head/upperparts that I've noted thus far, and also was the first AMRO on which I noticed a diffuse brown chest band (in the manner of Varied Thrush):

4) Jan 13, 2003: This bird also has a diffuse brown chest band, and also shows very little contrast on the rump/uppertail coverts; finally, it looks rather short-tailed and "petite" (especially in the back shot) - instead of the normal robust "feel" of AMRO:

5): Jan 13, 2003: A most interesting bird:- note the extensive grayish brown wash on the chest below the throat that mostly obsures the underlying red color, and the extent of white on the breast; if this individual also sported a supercilium, it could easily lead an observer to think about Eyebrowed Thrush (Turdus obscurus):

6) Jan 27, 2003: At each end of the continuum, these birds look very different from each other, and at a distance the right bird could be taken for something more exotic:

- closer looks show it is clearly an American Robin - but with much reduced red on the underparts, and with an obvious, blotchy gray-brown wash on the chest:

- the same bird in Feb 4, 2003; note how from this angle the breast looks VERY odd!; had this one photo been submitted as something more exotic, it might have given reviewers a few problems: