This bird stands out from its relatives thanks to its larger size, emerald green plumage, and mask-shaped pattern reminiscent of rubies on its face. The grass-green tanager (Chlorornis riefferii ) is instantly recognizable by its brilliant emerald green plumage and distinctive rusty mask and rusty vent area. This bird is 20 cm long and weighs 53 g. Its beak, irises, and legs are brick red like its mask. Females, on the other hand, do not have the black lobes, small black spots on the throat, or the characteristic blue wings of males. These birds are commonly found in the Andean regions of Colombia, Ecuador, Bolivia and Peru at altitudes between 1,500 and 3,350 meters.

It forages in the moist mota forest canopy, often traveling in mixed-species flocks.

It is known that green grass beetles participate in mixed-species foraging flocks, moving through the low to mid-level forest floor in search of fruits and insects. Like other hunters, they use their beaks to crush larger fruits or those that are difficult to jump to reach inside the octopus, eliminating the ability to jump.

Little is known about the breeding habits of this bird, however, it is known that the female incubates the young alone and that the male may bring her food while he sits on the nest and helps raise the young until they are born. when they become adults. Young birds can stay with their parents for many months after flying away, forming a small family group.

Grass Greenп Tanпager is a common grove in the reed forests of the eastern slopes of Ades at altitudes from 2000 to 3500 m.