Microchera chionura
Silhouette: Andy Wilson · PhyloPic
In 3 days ~60% in a week ~90%
The white-tailed emerald (Microchera chionura) is a species of hummingbird in the "emeralds", tribe Trochilini of subfamily Trochilinae. It is native to the Talamancan montane forests. The white-tailed emerald was formerly placed with the coppery-headed emerald in the genus Elvira. A molecular phylogenetic study published in 2014 found that these two species were closely related to the snowcap in the then-monospecific genus Microchera. The International Ornithological Committee and the Clements taxonomy placed the three species together in Microchera which has priority. However, BirdLife International's Handbook of the Birds of the World retains them in Elvira.
The white-tailed emerald is monotypic. The white-tailed emerald is 7.5 to 8 cm (3.0 to 3.1 in) long. Males weigh about 3.3 g (0.12 oz) and females 3.1 g (0.11 oz). Both sexes have an almost straight black bill whose mandible has a pinkish base. The adult male has bronzy green upperparts that becomes dark copper-bronze on the uppertail coverts. Its central two pairs of tail feathers are copper-bronze and the other three pairs white with black tips. It has a glittering green throat... Wikipedia →
Call0:36
Costa Rica · 2016
© Frank T Spooner · XC362253 · CC BY-NC-SA 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chirripó National Park | 🇨🇷 Costa Rica | |
| 2 | Volcán Barú National Park | 🇵🇦 Panama | |
| 3 | La Amistad International Park (Panama) | 🇵🇦 Panama | |
| 4 | Los Quetzales National Park | 🇨🇷 Costa Rica | |
| 5 | Tapantí-Macizo de la Muerte National Park | 🇨🇷 Costa Rica |
Possible
About 30% of wildlife watchers report a White-tailed Emerald sighting in Chirripó National Park on a given day, based on 418 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 34th most-seen of the 332 birds we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
September
In that month about 60% of wildlife watchers report a White-tailed Emerald in Chirripó National Park on a given day, against about 20% in February–March, May, July, October and December, the lowest months. That is one of Chirripó National Park's wettest months, with about 550 mm of rain against 75 mm in February.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most White-tailed Emerald sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 5 parks where we can rate White-tailed Emerald sightings, Chirripó National Park has the highest daily chance: about 30%. Next come Volcán Barú National Park (Panama, about 10%) and La Amistad International Park (Panama) (Panama, about 10%).
Same family: Trochilidae
The closest relatives of the White-tailed Emerald that you can see in Chirripó National Park (family Trochilidae, Hummingbirds) are Rufous-tailed Hummingbird (about 60%), Snowy-bellied Hummingbird (about 40%) and Violet Sabrewing (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White-tailed Emerald is recorded against all the birds logged in Chirripó National Park (418 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.
