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California, south-central Arizona, southeastern New Mexico, and south-central Texas. It is the most migratory subspecies, migrating as far as South America, where it overlaps the range of the smaller C. a. aura. It differs from the eastern turkey vulture in color, as the edges of the lesser wing coverts are darker brown and narrower. C. a. ruficollis, the tropical turkey vulture, is found in Panama south through Uruguay and Argentina. It is also found on the island of Trinidad. It is darker and more black than C. a. aura, with brown wing edgings which are narrower or absent altogether. The head and neck are dull red with yellow-white or green-white markings. Adults generally have a pale yellow patch on the crown of the head. C. a. septentrionalis is known as the eastern turkey vulture. The eastern and western turkey vultures differ in tail and wing proportions. It ranges from southeastern Canada south through the eastern United States. It i s less migratory than C. a. meridionalis and rarely migrates to areas south of the United Stas a wingspan of 160–183 cm (63–72 in), a length of 62–81 cm (24–32 in), and weight of 0.8 to 2.41 kg (1.8 to 5.3 lb). Birds in the northern limit of the species' range average larger in size than the vulture from the neotropics. 124 birds from Florida averaged 2 kg (4.4 lb) while 65 and 130 birds from Venezuela were found to average 1.22 and 1.45 kg (2.7 and 3.2 lb), respectively. It displays minimal sexual dimorphism; sexes are identical in plumage and in coloration, and are similar in size. The body feathers are mostly brownish-black, but the flight feathers on the wings appear to be silvery-gray beneath, contrasting with the darker wing linings. The adult's head is small in proportion to its body and is red in color