Arborófila pechicastaña (graydoni) Tropicoperdix graydoni

Intricately-patterned partridge of tropical lowland rainforest. Uncommon and declining throughout its range. Brown with buff scaling, rusty bib, stippled black-and-white head pattern, and a pale throat. Forages in small flocks on the forest floor. Found at lower altitudes than other partridges in range and distinguished by pale ear patch and lack of rufous on the head. Song, often given as a duet, consists of loud, tremulous whistles followed by a series of up and down notes “weep! churrrrr…!”.