Complexity in the vocal muscles also translates in to more complex song. Birds sing to defend territory and to attract mates. Some species even sing when pursued by predators to convey how robust they are. On the whole, males sing more than females. The male brown thrasher has command of some 2000 difference songs. Male and female birds sometimes sing duets and groups of birds may sing together to defend a territory.
Some species are especially adept at mimicry. Some Scottish starlings reproduces the sounds of sheep some English starlings even mimic city buses.
-Window To News
