Table 2.

Auditory similarity within and between species as calculated by a computational auditory model simulating cochlear filtering followed by temporal-envelope decomposition via a modulation filterbank.

Species	Erithacus rubecula	Fringilla coelebs	Periparus ater	Phylloscopus collybita	Regulus regulus	Sylvia atricapilla	Turdus merula	Turdus philomelos
Erithacus rubecula	0.96	0.94	0.92	0.90	0.73	0.93	0.72	0.87
Fringilla coelebs		0.98	0.83	0.83	0.70	0.97	0.87	0.89
Periparus ater			0.97	0.95	0.80	0.86	0.58	0.78
Phylloscopus collybita				0.95	0.81	0.83	0.53	0.76
Regulus regulus					0.90	0.64	0.37	0.63
Sylvia atricapilla						0.98	0.86	0.90
Turdus merula							0.91	0.79
Turdus philomelos								0.84

Auditory similarity was estimated by the dot product of model outputs to pairs of birds' vocalizations. The higher the value of the dot product, the more similar birds' vocalizations. Within-species similarities are shown in the secondary diagonal (bold characters); between-species similarities are shown by the remaining number in the columns (excluding the secondary diagonal).