Черноголовый ангу Donacobius atricapilla

Unmistakable thrasher-like species found in lowland marshy habitats from extreme eastern Panama to northern Argentina. Dark brown upperparts (blacker on the head) and buffy underparts with staring yellow eye, white wing patch, and large white tips on tail. Often vocal and conspicuous; pairs perch in the open and give loud ringing calls and harsh chatter.