Regulus calendula
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~80% in a week >90%
The ruby-crowned kinglet (Corthylio calendula) is a very small passerine bird found throughout North America. It is a member of the kinglet family. The bird has olive-green plumage with two white wing bars and a white eye-ring. Males have a red crown patch, which is often concealed. The sexes are identical apart from the crown, and juveniles are similar in plumage to adult females. It is one of the smallest songbirds in North America. The ruby-crowned kinglet is not closely related to other kinglets and was moved from Regulus to its own genus, Corthylio, in 2021. Three subspecies are currently recognized.
The kinglet is mostly migratory, and its range extends from northwest Canada and Alaska south to Mexico. Its breeding habitat is spruce-fir forests in the northern and mountainous regions of the United States and Canada. The ruby-crowned kinglet builds a cup-shaped nest, which may be pensile or placed on a tree branch and is often hidden. It lays up to 12 eggs, and has the largest clutch of any North American passerine for its size. It is mainly insectivorous, but also eats fruits and seeds.
The ruby-crowned kinglet was formally described in 1766 by the Swedish naturalist... Wikipedia →
Recording0:04
United States · 2025
© zhen (he/him) · iNaturalist · CC BY-NC 4.0
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United States · 2024
© Sue Brady · iNaturalist · CC BY-NC 4.0
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Canada · 2023
© danielalain · iNaturalist · CC BY-NC 4.0
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Toluca | 🇲🇽 México | |
| 2 | San Antonio | 🇺🇸 United States | |
| 3 | Austin | 🇺🇸 United States | |
| 4 | Mexico City | 🇲🇽 México | |
| 5 | Sacramento | 🇺🇸 United States | |
| 6 | Houston | 🇺🇸 United States | |
| 7 | Puebla | 🇲🇽 México | |
| 8 | Mesa | 🇺🇸 United States | |
| 9 | Monterrey | 🇲🇽 México | |
| 10 | Seattle | 🇺🇸 United States |
Likely
About 40% of wildlife watchers report a Ruby-crowned Kinglet sighting in Cumbres de Monterrey National Park on a given day, based on 977 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 10th most-seen of the 275 birds we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
December
In that month about 90% of wildlife watchers report a Ruby-crowned Kinglet in Cumbres de Monterrey National Park on a given day, against under 5% in June to August, the lowest months. That is one of Cumbres de Monterrey National Park's driest months, with about 20 mm of rain against 180 mm in September.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Ruby-crowned Kinglet sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
8th of 45
Of the 45 parks where we can rate Ruby-crowned Kinglet sightings, Cumbres de Monterrey National Park ranks 8th at about 40%. The best odds are in Reserva de la Biosfera Mariposa Monarca (Mexico, about 70%), Grand Teton National Park (United States, about 60%) and Gros Morne National Park (Canada, about 60%). All parks ranked.
Same order: Passeriformes
The closest relatives of the Ruby-crowned Kinglet that you can see in Cumbres de Monterrey National Park (order Passeriformes, Perching Birds) are Black-crested Titmouse (about 70%), Green Jay (about 60%) and Carolina Wren (about 60%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Ruby-crowned Kinglet is recorded against all the birds logged in Cumbres de Monterrey National Park (977 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.
