It has a total length of approximately 34 cm (13 in).[3] The sexes are very similar in appearance, except that the female is slightly larger than the male. Juveniles appear quite similar to adults.
The species has dark brown upperparts streaked with white, and whitish-buff throat, breast, underparts and rump. The tail is relatively long and broad, dark brown in color with a white-tip, and the legs are dark gray. The eyes and beak are yellow to orange, with a thin ring of featherless yellow skin around the eye (this commonly fades in captivity). There is a prominent orange-rufous crest.
Like other members of the subfamily Crotophaginae, the guira cuckoo gives off a strong, pungent odour.[4]