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Facial display and blushing: Means of visual communication in blue-and-yellow macaws (Ara Ararauna)?

Fig 1

Repertoire of head feather displays.

Photographic representation of the position of crown, nape and cheek feathers. (All photographs taken by A. Beraud).

Fig 1

doi: https://doi.org/10.1371/journal.pone.0201762.g001