songless

They are a songless tribe, although their quick, reiterated call as they take to flight has given them the name of chatterers.
Little Rivers|Henry van Dyke
The males, who sing, have more white on the wings and tail than the females, who are songless.
Citizen Bird|Mabel Osgood Wright and Elliott Coues
While the Flycatchers are therefore technically classed as songless birds, it does not follow that they have no songs.
Color Key to North American Birds|Frank M. Chapman
The poet wonders what "songless tongueless ghost of sin crept through the curtains of the night."
Oscar Wilde|Leonard Cresswell Ingleby

That, then, is another of the supposed songless birds added to the list of singers.
Upon The Tree-Tops|Olive Thorne Miller