Baby barn swallows posturing for food
Barn swallow nestlings will call, open and close their mouths, and posture to request food from their parents. This is known as honest signaling.
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References
Into the nest: Open wide! (2020, April 1). Madison Audubon. https://madisonaudubon.org/blog/2018/...
De Ayala, R. M., Saino, N., Møller, A. P., & Anselmi, C. (2007). Mouth coloration of nestlings covaries with offspring quality and influences parental feeding behavior. Behavioral Ecology, 18(3), 526-534. https://doi.org/10.1093/beheco/arm006
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