A tiny parrot of lowland and foothill forest. Mostly green with yellow undertail, blue tail and large buffy face with contrasting dark crown patch. As with other pygmy-parrots, climbs on trunks with its outsized feet, like a nuthatch feeding on lichens and bark fungus. May overlap with Red-breasted or Yellow-capped Pygmy-Parrots, but Buff-faced, lacks the red belly, yellow crown and has a more extensive buffy face. Call, a very high-pitch note of varying lengths, “siiiiii!” or double “sii sii!”