Camptostoma imberbe
Silhouette: Emily Willoughby · PhyloPic
In 3 days ~20% in a week ~30%
The northern beardless tyrannulet (Camptostoma imberbe) is a small passerine bird in the tyrant flycatcher family. It breeds from southeasternmost Arizona and Texas of the United States through Mexico and Central America to northwestern Costa Rica.
This species is found in light forests, cultivation and gardens with trees. The domed nest is made of plant fibre or leaves with a side entrance. The nest is placed by a tree fork. The typical clutch is two white eggs, which are marked with rufous and lilac mostly at the larger end. Incubation by the female is 14–15 days to hatching, with another 17 days to fledging.
The northern beardless tyrannulet is 10.2 cm (4.0 in) long, and weighs 7.5 g (0.26 oz). The head is dark brown with an erectile crest and pale supercilium. The upperparts are grey-green becoming paler on the rump. The wings are brown with yellow feather-edging and two whitish wing bars. The tail is brown, the throat grey, the breast yellowish, and the abdomen yellow. The bill is pinkish.
Sexes are similar, and this species always appears not as bright, especially with regard to the wing bars, as the closely related southern beardless tyrannulet, C. obsoletum, with which it was once considered conspecific. However, the two forms overlap without interbreeding in Costa Rica.
Northern beardless tyrannulets are active birds, feeding in a vireo or warbler-like fashion on insects, spiders and berries. The call is a loud whistled Fleeeeeerrr, sometimes broken up as a fleeer-it, or a flee-flee-flee-flee. In courtship, or when alarmed, the crests are raised, the tail flicked, and an excited call is made. Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Puebla | 🇲🇽 México | |
| 2 | Mexico City | 🇲🇽 México | |
| 3 | León | 🇲🇽 México | |
| 4 | Guadalajara | 🇲🇽 México | |
| 5 | San Pedro Sula | 🇭🇳 Honduras | |
| 6 | San José | 🇨🇷 Costa Rica | |
| 7 | Monterrey | 🇲🇽 México | |
| 8 | San Salvador | 🇸🇻 El Salvador | |
| 9 | Managua | 🇳🇮 Nicaragua | |
| 10 | Guatemala City | 🇬🇹 Guatemala |
With luck
About 10% of wildlife watchers report a Northern Beardless-Tyrannulet sighting in León on a given day, based on 6 verified sightings from GBIF citizen-science data. It is the 117th most-seen of the 124 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
July and December–January
In those months about 10% of wildlife watchers report a Northern Beardless-Tyrannulet in León on a given day, against under 5% in February–May and August–November, the lowest months. June has too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Northern Beardless-Tyrannulet sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 10 cities where we can rate Northern Beardless-Tyrannulet sightings, León ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Puebla (México, about 10%) and Mexico City (México, about 10%).
Same family: Tyrannidae
The closest relatives of the Northern Beardless-Tyrannulet that you can see in León (family Tyrannidae, Tyrant Flycatchers) are Cassin's Kingbird (about 80%), Vermilion Flycatcher (about 80%) and Great Kiskadee (about 50%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Northern Beardless-Tyrannulet is recorded against all the birds logged in León (6 verified sightings), 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.
