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This somewhat atypical Great Bue Heron (Ardea herodias) was photographed in my yard on Lake Worth, Fort Worth, Texas on December 20, 2002:

Aging this bird is not straightforward (for me, anyway), but it looks adult-like and should be at least in its second calendar year, thus not a juvenile or first-winter. It sports a number of features that are unusual for GBHE of this age, and reminiscent of Grey Heron (GRHE):
a) The sides of the neck are almost devoid of any warm tones - just a hint of vinaceousness that is well within range of that shown by some GRHE.
b) The black lateral crown stripe is very deep - more like that of GRHE.
c) The pattern of the lores approachs that of some GRHEs, in that the basal part is cleanly dark gray, while the distal part is largely yellow (but a bit less extensive than is typical for GRHE.)
d) In the field the thigh feathering appeared to be gray. It was only while studying my photos that I was able to determine that the outer feathering of the thighs is gray while the inner feathering is rufous. Hints of rufous are also visible through the breast plumes on some photos (not used here), but were not at all visible in field conditions.
e) The legs are medium gray below the "knee" and pale gray above the "knee" - this is supposed to be a strong GRHE feature that should not be seen in GBHEs of this age

Compare the above bird to the non-first-year Grey Heron in these wonderful photos by Nigel Blake from late October in the UK. Note also in Nigel's photos that this GRHE has obvious (with close looks) rufous elements in the coverts on the bend of the wing - this has not been mentioned for GRHE of this age in the ID literature (see below.)

A bird like the above GBHE might lead to a claim of GRHE, if the rufous elements were further-reduced or not seen in the field (note that when this GBHE flew, no rufous was seen in the leading edge of the wing.) The leg proportion seems to offer a helpful comparison: on the GBHE the tail-tip reaches only about one-third (or less) below the "knee", while on Nigel's GRHE the tail-tip is more than half-way below the "knee"; further checking of this feature may provide a useful long-distance clue for a potential vagrant (or not!).

ID references:
Gantlett, S.: Identification of Great Blue Heron and Grey Heron; BIRDING WORLD Vol 11 No. 1 p12-20.
Clarke, T.: The Great Blue Heron on Tenerife; BIRDING WORLD Vol 12 No. 4 p158-161.
Lethaby, N. & McLaren, I.: The Identification of Gray Heron; BIRDING Vol 34 No. 1 (Feb 2002) p 24-33.