What makes mountain birds sing at dawn—and why are they sometimes quiet? Ecologists explain

Three species of the melodic African warbler bird refuse to get up early and sing their customary daybreak songs when the ...
PBS

Bird Songs

poets and musicians, from Chaucer to Wordsworth, from Handel to Respighi. Birdsong can be a natural phenomenon of intense beauty. But our enjoyment is incidental to the main purpose, which is one bird ...