Figure 2. Mean (±SE) begging duration according to context and body mass rank.

The three contexts are Control (no nestlings are food deprived), FD nestlings (after 90 min of food deprivation) and siblings of the 90 min FD nestlings. Average values of the two heaviest and the two lightest nestlings are represented as respectively white and grey histograms. Post hoc comparisons across contexts (heaviest and lightest nestlings combined) are represented with asterisks (*P < 0.05; ***P < 0.001). N represents the number of experimental nests.