Due to the difficulty of spotting the small birds in the sometimes thick vegetation, biologists working at the refuge listen for their distinctive calls. These calls were all recorded in central Texas in 2010 by Chris Warren.

This is an example of typical A-type song for Travis Co. sung at a slow rate.

This is an example of typical B-type song for Travis Co. sung at an excited rate.

Typical A-type song for Travis Co. with a typical number of introductory notes.