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The grey parrot is a medium-sized, predominantly grey, black-billed parrot. Its typical weight is 400 g (0.88 lb), with an approximate length of 33 cm (13 in),[2] and a wingspan of 46–52 cm (18–20 in).[3] It has darker grey than its body over the head and both wings. The head and body feathers have slight white edges. The tail feathers are red.

Due to selection by parrot breeders, some grey parrots are partly or completely red.[4] Both sexes appear similar.[2] The colouration of juveniles is similar to that of adults, but typically their eyes are dark grey to black, in comparison to the yellow irises around dark eyes of the adult birds,[5] and their undertail coverts are tinged with grey.[2] Adults weigh 418–526 g (0.922–1.160 lb).[6]