Table 8. Brownie results for song traits when birds are divided into shorter learning (early song stability) and longer learning (delayed song stability plus song plasticity).

Rate columns show mean log likelihood. Song traits are sorted from most to least significant.

Song trait	One rate	Two rates	p-value
Song repertoire	-100.812	-97.9918	0.018*
Syllable repertoire	-107.3206	-105.8488	0.086

*Denotes traits where the more complex model fit the data significantly better than the simpler model.