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Bird name:

Aquatic Warbler

Acrocephalus paludicola




Old World Warblers (Sylviidae)





Euring 5

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Breeding Location:

Swamps, Marshes, Meadows, damp, Reedbeds

Breeding Type:

Polygamous, Polyandrous

Egg Colour:

Smooth, glossy and white or pale olive with evenly distributed fine olive specks.

Number of Eggs:

4 - 6

Incubation Days:

12 - 15

Egg Incubator:

Both sexes

Nest Material:

Cup made of grass, reeds and spider webs; sometimes lined with feathers.

Nest Location:

On marshy ground or in a clump of sedge in shallow water.




Aquatic Warbler: Small, marsh warbler with black and buff streaking on upperparts. Underparts buff and white with variable amount of fine streaking in adults. Face has pale lores. Wings and tail brown with black streaks. Bill grey with yellow lower mandible, legs and feet pink. Immatures lack streaking on underparts and have more yellowish coloration. Sexes have similar plumage.

Range and Habitat

Aquatic Warbler: Rare autumn visitor in areas of southern Britain. Stops off on its way between breeding grounds in eastern Europe and its winter home in West Africa. Found in thick vegetation close to the ground or water in coastal reedbeds along the southern coast.

Breeding and Nesting

Aquatic Warbler: Polygamous and polyandrous, with nestlings in a single nest sired by as many as five males. Nests are built from reeds and are often situated about a foot above marshy ground or in a clump of sedge in shallow water. Eggs may be incubated by both sexes and two clutches may be laid.

Foraging and Feeding

Aquatic Warbler: Feeds mostly on small invertebrates such as spiders, flies, caterpillars and grubs, which are picked off vegetation or taken in flight. Also eats berries. Diet varies seasonally based on availability. Often feeds from the ground.


Aquatic Warbler: Not easily described. Roughly a somewhat monotonous "trrrrr-dew-dew-dew-churrrrr-di-di-di." Call is "tuk," "chuck," or "cher-cherr."

Similar Species

Aquatic Warbler: The Sedge Warbler has weaker black streaking on the mantle. It also has narrower striping of the upperparts.


Belly, undertail coverts, chest, flanks, and foreneck.

Back, rump, hindneck, wings, and crown.
The front part of the head consisting of the bill, eyes, cheeks and chin.
Lower mandibleX
The lower part of the bill.
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