Small dark nightjar of humid lowland forest in the Yucatan Peninsula, heard far more often than seen. Favors dense tangled forest, less often edges, and usually sings from a concealed perch. Sexes look similar, cryptic brown to rusty overall with a rather plain, dark face and throat, white ‘vicar’s collar,’ and narrow white tail tip. Loud, resonant whistled whierrr song is repeated steadily.