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Bird name:

Western Bonelli's Warbler

Phylloscopus bonelli




Old World Warblers (Sylviidae)





Euring 5

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Breeding Location:


Breeding Type:

Monogamous, Solitary nester

Egg Colour:

White with brown spots.

Number of Eggs:

4 - 6

Incubation Days:

12 - 13

Egg Incubator:


Nest Material:

Grass, leaves, moss, and hair.

Nest Location:

On the ground, under hanging vegetation.




Western Bonelli's Warbler: This small leaf warbler is grey-brown above, white below with a yellow-green rump and diffuse, white-grey eyebrow. Small, buff-brown and grey bill, and pink-brown legs. Medium length black-grey wings have yellow-olive edging to feathers. Medium length tail has some yellow-olive edging to feathers. This species forages for small insects and other arthropods by picking prey off of vegetation with its bill.

Range and Habitat

Western Bonelli's Warbler: Very rare vagrant in the UK & Ireland with less than ten records per year on average. It has occurred in many regions of the UK, and is most likely to be seen during the months of August, September, and October. Breeds in north Africa and southwest and central Europe east to Austria. Spends winters in the western Sahal area of Africa. This species prefers gardens and a variety of forested habitats.

Breeding and Nesting

Western Bonelli's Warbler: Five to six, heavily speckled buff-white eggs are laid in a domed, cup nest constructed with grass, leaves, and moss, and lined with hair. The nest is built on the ground or bank, underneath hanging vegetation. The eggs are incubated by the female for 12 to 13 days.

Foraging and Feeding

Western Bonelli's Warbler: This small leaf warbler feeds on small insects and other arthropods. It forages by actively moving through vegetation of bushes and trees, and picking up prey with its bill. It often forages in the small twigs and leaves in the outer part of a tree crown.


Western Bonelli’s Warbler: Song is a series of descending, short trilled phrases. Call is a repeated "tuiit", "swee-eet", or a soft "pe-wee-oo".

Similar Species

Western Bonelli's Warbler: Similar species have yellow throats, breasts or bellies.

Also called the supercilicum or superciliary it is the arch of feathers over each eye.
The area between the uppertail coverts and the back of the bird.
The crown is the top part of the birds head.
4 and 6 letter alpha codesX

The four letter common name alpha code is is derived from the first two letters of the common first name and the first two letters of common last name. The six letter species name alpha code is derived from the first three letters of the scientific name (genus) and the first three letters of the scientific name (species). See (1) below for the rules used to create the codes..

Four-letter (for English common names) and six-letter (for scientific names) species alpha codes were developed by Pyle and DeSante (2003, North American Bird-Bander 28:64-79) to reflect A.O.U. taxonomy and nomenclature (A.O.U. 1998) as modified by Supplements 42 (Auk 117:847-858, 2000) and 43 (Auk 119:897-906, 2002). The list has been updated by Pyle and DeSante to reflect changes reported by the A.O.U from 2003 through 2006.


The Integrated Taxonomic Information System (ITIS) was established in the mid-1990 s as a cooperative project among several federal agencies to improve and expand upon taxonomic data (known as the NODC Taxonomic Code) maintained by the National Oceanographic Data Center (NODC), National Oceanic and Atmospheric Administration (NOAA).

To find the ITIS page for a bird species go to the ITIS web site advanced search and report page at You can enter the TSN or the common name of the bird. It will return the ITIS page for that bird. Another way to obtain the ITIS page is to use the Google search engine. Enter the string ITIS followed by the taxonomic ID, for example "ITIS 178041" will return the page for the Allen's Hummingbird.

Parts of a Standing birdX
Head Feathers and MarkingsX
Parts of a Flying birdX