Chlorornis riefferii
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The grass-green tanager (Chlorornis riefferii) is a small South America bird in the tanager family Thraupidae. It is the only member of the genus Chlorornis. The grass-green tanager is 20 cm in length and weighs 53g. It lives in and around subtropical and temperate forests in the Andes of Colombia, Ecuador, Bolivia, and Peru at elevations of 1500–3350 m.
It is seen in pairs or in groups of 3-6 individuals. It forages mostly on the upper half of short trees and eats fruits and insects. It is known to perch almost horizontally. Its nest is made of mosses and ferns, and its eggs are gray with light purple-grey dots.
The grass-green tanager was formally described in 1840 by the French ornithologist Auguste Boissonneau from a specimen collected near Bogotá in Colombia. He coined the binomial name Tanagra riefferii. The species is now the only member of the genus Chlorornis that was introduced in 1850 by the German naturalist Ludwig Reichenbach. The genus name combines the Ancient Greek khlōros meaning "green" and ornis meaning "bird". The specific epithet was chosen to honour the collector Gabriel Rieffer. The grass-green tanager has a sister relationship to the genus Cnemathraupis... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Podocarpus National Park | 🇪🇨 Ecuador | |
| 2 | Los Nevados National Natural Park | 🇨🇴 Colombia | |
| 3 | Chingaza National Natural Park | 🇨🇴 Colombia | |
| 4 | Farallones de Cali National Natural Park | 🇨🇴 Colombia |
Rare
Under 5% of wildlife watchers report a Grass-green Tanager sighting in Farallones de Cali National Natural Park on a given day, based on 30 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 390th most-seen of the 542 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Grass-green Tanager in Farallones de Cali National Natural Park on a given day, so our monthly data shows no clear season.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Grass-green Tanager sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 4
Of the 4 parks where we can rate Grass-green Tanager sightings, Farallones de Cali National Natural Park ranks 4th at under 5%. The best odds are in Podocarpus National Park (Ecuador, about 20%), Los Nevados National Natural Park (Colombia, under 5%) and Chingaza National Natural Park (Colombia, under 5%).
Same family: Thraupidae
The closest relatives of the Grass-green Tanager that you can see in Farallones de Cali National Natural Park (family Thraupidae, Tanagers and Allies) are Flame-rumped Tanager (about 70%), Blue-gray Tanager (about 70%) and Green Honeycreeper (about 70%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Grass-green Tanager is recorded against all the birds logged in Farallones de Cali National Natural Park (30 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
