Identification: Both sexes are green overall with well-delineated grey forehead extending to crown, yellow rump, and green edges to flight feathers ending in dark tips. Male has maroon wings and mantle, orange patch on breast, and chestnut undertail coverts. Female resembles male but lacks the maroon, orange breast patch, and chestnut undertail coverts. Can be separated from similar looking Thick-billed Green Pigeon by the lack of thick bill and bluish-green orbital ring. Females look similar to other Treron species, and can be differentiated from female Cinnamon-headed Green Pigeon by lack of red base to bill, while female Pink-necked Green Pigeon lacks the grey forehead and crown. Female Orange-breasted Green Pigeon has a blue base to bill and grey nape, and lacks the grey forehead. Female Little Green Pigeon is much smaller and has light yellow irises compared to the dark pink irises of Ashy-headed Green Pigeon.