Изменчивый колючник Thamnophilus caerulescens

Small antshrike with extensive plumage variation among subspecies for both sexes. Found in the lower and middle levels of woodland and second growth. Typical males are dark gray with a dark cap, white wing coverts, and a white-tipped tail. Andean subspecies are black above and black or barred below. Females are rusty-brown, with most having well marked, spotted wingbars. The song is a loud and fast series of 7 “ka-ka-ka-ka-ka-ka-ka” notes.