|Cetti's warbler by the Kalloni east river, Lesvos, Greece.|
Cetti's Warbler (pron.: //), Cettia cetti, is an Old World warbler. It is a small brown bush warblers which breeds in southern and central Europe, northwest Africa and east southern temperate Asia as far as Afghanistan and NW Pakistan. It is the only bush warbler to occur outside Asia. It is a recent colonist to southern England and Wales, with the first breeding records for the UK in 1961. The Cetti's Warbler is pronounced as "chetty" and this bird is named after an 18th-century Italian zoologist Francesco Cetti. This species is a skulking bird, meaning that the birds are very difficult to see - as difficult to see as a nightingale. They tend to show themselves for only short moment.
Cetti's Warblers were first recorded in Britain in 1961, at Titchfield Haven, Hampshire. Unlike other Cettia species, the Cetti’s Warblers were widespread across the south and east of England and other regions of Europe. Thus, this species are commonly found around the coasts of East Anglia, Kent, Sussex and Hampshire. The Cetti's Warblers experienced a slight decline during 1970s and 1980s. Cetti's Warblers of the Kent population underwent a temporary extinction in 1988 due to severe winters in 1978. Also, overall UK population of Cetti's Warblers fell by over a third of total population between 1984 and 1986. However, population of Cetti's Warblers in milder regions continued to grow. The number of Cetti’s Warbler has greatly increased across Europe since 1990. The current population of Cetti's Warblers in Europe is estimated to be about 600,000-1,600,000 breeding pairs. The population in Italy and Turkey are also known to be stable or increasing. The exception to this general positive population trend is found in Greece, where the population decreased slightly during 1990-2000. However, overall, Cetti’s Warblers are evaluated as secure species.
Physical Appearance 
The size of Cetti’s Warbler is small. The length of this species is known as approximately 13 cm to 14 cm. The weight of the male of 15 g and the weight of the female of 12 g. Cetti’s Warblers possess a rounded head with a narrow pale grey stripe arching over conspicuous black eyes, and short rounded wings. They also display feathers that are a rich chestnut or dark reddish-brown color that covers mainly the upper parts of the warbler: the head, wings and back. On the front side, the warblers are pale grey color on the throat and stomach. Also, their tails are longer and broader than most of other warblers. In addition to this, physical appearance of both sexes looks very alike. However, male Cetti's Warblers are 26% to 32% heavier than females. Also, size of the feather can be useful character to identify sex because it slightly varies from one another. Male Cetti's Warblers are known to be 11.2% to 13.% larger than females in wing-length Male has a wing longer than 60 mm; female has a wing shorter than 55 mm. The age of Cetti’s warbler can be estimated by its physical appearance. Juvenile Cetti’s warbler looks similar to adults. It has fresh plumage that appears to have two dark or dark grey spots on the tongue.
Cetti's Warblers signal their presence with very loud song, producing songs at high frequencies. Listen to Cetti's Warbler's loud call. During the summer, the males spend most of their time establishing their territories. While establishing their territories, they spend little amount of time caring for the eggs or the young. After establishing their territories, the males usually attract more than one female Cetti’s Warbler to their territory with their songs. Their songs play important role. Their songs are distinct, and come in loud bursts, so that they have a unique structure to allow them to find their own species and prevent heterospecific mating. In general, the warblers, like C. seebohmi and C. diphone, can avoid heterospecific mating by recognizing their own species' distinct song structure.
Habitat/ Food 
This species usually inhabits damp areas including ponds, lakes, marshes and rivers. The Cetti’s Warblers are a small insectivorous birds. Their prey on arthropods such as small soft-bodied insects and even larvae that are found in ponds, lakes, and rivers. This species prefers tiny insects because they can digest them faster.
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