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The skull and brain endocast of a ruffed grouse. (a) The brain endocast (three‐dimensionally modelled in blue) of a ruffed grouse (Bonasa umbellus, AMNH Birds SKEL 21616) in its hemisected skull as compared to its (b) endocranial cavity (outlined in blue). In birds, the endocast has been shown to be a faithful representative of the surface structure of the brain itself
