Time birds spent allopreening nest-mates related to amounts of excreted corticosterone metabolites (ng/g feces) in UVM nestlings (a) but not in KLF-2 nestlings (b). UVM nestlings: N=6, raised all together in one nest, KLF-2 nestlings: N=9, raised in 4 different nests, numbers in the graph indicate nest number. CM data of three nestlings of nest 1 are missing, therefore data of only one bird of this nest are included. We inserted the results of Spearman rank-order correlations.