The different types of syntactical organization exhibited by the hybrid quails.

‘S0S’ indicates that the motif is composed of 2 syllables (code S) separated by a silence (code 0). 2s, 3s, 4s and 5s: total number of motifs composed respectively of 2, 3, 4 and 5 syllables. 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.