The lesser ground cuckoo (Morococcyx erythropygus) is a species of cuckoo in the tribe Neomorphini of subfamily Crotophaginae. It is found in Costa Rica, El Salvador, Guatemala, Honduras, Mexico, and Nicaragua. Taxonomy and systematics The lesser ground cuckoo is the only member of its genus. It has two subspecies, the nominate M. e. erythropygus and M. e. mexicanus. Description The lesser ground cuckoo is long. Males weigh about and females about . Females are somewhat paler than males but otherwise do not differ. They have a slightly decurved bill with a blackish brown maxilla and an orange mandible. Their face is intricately patterned, with a bright yellow ring around the eye with bare blue skin behind it and thin black lines surrounding the area, a short indistinct whitish stripe above the eye, and cinnamon ocracous cheeks. Adults of the nominate subspecies have a grayish brown crown, an olive brown nape and back, a sooty blackish lower back and rump, and olive brown uppertail coverts. Their tail is mostly olive brown with a purplish bronze gloss and buff to whitish tips on top and light grayish brown on the underside with dull blackish bands near the end of the outer feathers. Their underparts from chin to vent are cinnamon ochraceous. Immatures are similar to adults but duller and do not have the pale tips and blackish bands on the tail. Adults of subspecies M. e. mexicanus are larger and paler than the nominate, with somewhat grayer upperparts and underparts tending to ochraceous buff or pale buff, but a darker underside to the tail. Distribution and habitat The nominate subspecies of lesser ground cuckoo is found from southern Mexico south through Guatemala, El Salvador, Honduras, and Nicaragua into Costa Rica. M. e. mexicanus is found on the Pacific slope of western Mexico between Sinaloa and the Isthmus of Tehuantepec. The species inhabits semiarid to arid landscapes including the interior and edges of woodlands, thorn forest, secondary forest, and savanna. Those in southwestern Mexico are almost exclusively found in thorn forest. Behavior Movement The lesser ground cuckoo is a year-round resident throughout its range. Feeding The lesser ground cuckoo feeds on insects captured while walking on the ground or picked from vegetation with short leaps. Details of its diet are lacking. Breeding The lesser ground cuckoo's breeding seasons vary geographically but are not fully known. In Costa Rica it breeds between February and