Phylloscopus collybita
Silhouette: Sharp Photography, sharpphotography.co.uk · PhyloPic
In 3 days ~40% in a week ~70%
The common chiffchaff (Phylloscopus collybita), or simply the chiffchaff, is a common and widespread leaf warbler which breeds in open woodlands throughout northern and temperate Europe and the Palearctic. It is a migratory passerine which winters in southern and western Europe, southern Asia and north Africa. Greenish-brown above and off-white below, it is named onomatopoeically for its simple chiff-chaff song. It has a number of subspecies, some of which are now treated as full species. The female builds a domed nest on or near the ground, and assumes most of the responsibility for brooding and feeding the chicks, whilst the male has little involvement in nesting, but defends his territory against rivals, and attacks potential predators.
A small insectivorous bird, it is subject to predation by mammals, such as cats and mustelids, and birds, particularly hawks of the genus Accipiter. Its large range and population mean that its status is secure, although one subspecies is probably extinct.
The British naturalist Gilbert White was one of the first people to separate the similar-looking common chiffchaff, willow warbler and wood warbler by their songs, as detailed in... Wikipedia →
Possible
About 20% of wildlife watchers report a Common Chiffchaff sighting in Sofia on a given day, based on 443 verified sightings from GBIF citizen-science data. It is the 31st most-seen of the 99 birds we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
September and October
In those months about 40% of wildlife watchers report a Common Chiffchaff in Sofia on a given day, against under 5% in May–June and December–February, the lowest months.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Common Chiffchaff sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
63rd of 119
Of the 119 cities where we can rate Common Chiffchaff sightings, Sofia ranks 63rd at about 20%. The best odds are in Tehran (Iran, about 60%), Jerusalem (Israel, about 50%) and Antalya (Turkey, about 50%).
Same genus: Phylloscopus
The closest relatives of the Common Chiffchaff that you can see in Sofia (genus Phylloscopus, Leaf Warblers) are Wood Warbler (about 10%) and Willow Warbler (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Common Chiffchaff is recorded against all the birds logged in Sofia (443 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.
