Mean values (±SEM) for all acoustic variables. Kruskal Wallis results for differences between groups.

Means with the same letter are not significantly different, Mann Whitney, p<0.05. S1, S2, S3: duration of Segment 1, 2, 3; TD: Total Duration; T12: time interval between impulsion 1 and impulsion 2; T23: time interval between impulsion 2 and impulsion 3. H1: female japonica × male coturnix; H2: female coturnix × male japonica; F2: female H1× male H1; BC1: female H1× male coturnix; BC2: female coturnix × male H1; EUR1: wawa of the European quail; EUR2: triplet of the European quail; JAP: japonica.