Vocalizations
The typical song of the Black-throated Trogon is described as "2-5 clear, mellow, descending whistles in a deliberate series, the later notes lower in pitch" (Costa Rica; Stiles and Skutch 1989); "two to four well separated cow notes" (Panama; Ridgely and Gwynne 1989); and "a slow, evenly spaced ser[ies] of ca 2-4 cuk or cuh notes, at rate of 1/sec or slower" (Venezuela; Hilty 2003).
Also gives a churring call, similar to other trogons.