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Mean (±s.e.) begging response rate by nestling tree swallows in noise and quiet treatments during short (4–12 min into trial) and long (13–21 min into trial) deprivation periods for: (a) parent-with-call, (b) parent-without-call, and (c) predator stimulus sounds. Response rate is the proportion of playbacks that stimulated begging (out of the six possible for each stimulus within each deprivation period; 3 playbacks/stimulus × 2 nestlings).
