Facial display and blushing: Means of visual communication in blue-and-yellow macaws (Ara Ararauna)?
Fig 2
A) Target zone used to estimate the presence or absence of blushing by a panel of 4 naïve observers. B) Photograph where all observers judged blushing to be present in the target zone. C) Photograph where no observers judged blushing to be present in the target zone. (All photographs taken by A. Beraud).