House Sparrow (Passer domesticus) Science Article 8
abstract
Begging is a complex display that is supposed to honestly indicate the need for food of nestlings, and, usually, parents use this informationto adjust their investment in food provisioning. However, the mechanisms that ensure the honesty of begging as an indicator ofneed are still poorly known.
Claire Loiseau et al, General and Comparative Endocrinology 155 (2008) 101-108