What function is suggested for the striking white iris of Vireo griseus in dense cover?

Answer

Serving as a critical element in mate recognition or territorial signaling

The bright white iris of the White-eyed Vireo is a highly distinctive feature, especially contrasted against its yellow-green plumage. In the dim light characteristic of the dense thickets and vine tangles where these birds frequently forage, a starkly contrasting color like pure white would be highly visible to conspecifics. This high contrast suggests it functions as a powerful visual communication tool, possibly acting as an "all-clear" signal or a means of establishing presence within the foliage where long-distance visual contact is impaired. This visual signaling environment, distinct from that of vireos with darker eyes, indicates strong selective pressure favoring high visibility in close-range interactions during speciation events.

What function is suggested for the striking white iris of Vireo griseus in dense cover?

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