Riparian Parrotlet

Riparian parrotlets are typically 12–13 centimetres (4.7–5.1 in) long and weigh about 28 grams (0.99 oz). Their bodies are mostly yellow-green. Eyes are dark brown and beaks and feet are light peach. Riparian parrotlets are sexually dimorphic: males have blue rumps and lower backs, with blue feathers along the leading edges of their wings and blue secondaries; primary coverts are blue-gray. Females have no blue feathers and a yellow-green belly.

Riparian parrotlets are found in southeastern Colombia to northern Peru and western Brazil. There is a small population on São Sebastião Island. Though they do not fully migrate, it has been suggested that riparian parrotlets are altitudinal migrants: abundance of the species in lowland areas increased during winter and spring; this is likely because during these seasons, the main plants of the large-billed parrotlets' diet were budding and providing more food. Riparian parrotlets tend to inhabit forest edges, riparian woodlands, and degraded or deforested areas.

Riparian parrotlets nest in tree cavities or similar places. They have been known to use the abandoned nests of rufous horneros and other unrelated species. Females lay 3-7 small white eggs, which are incubated for approximately 18 days before hatching.