Eurasian Wren

The Eurasian wren is a very small insectivorous bird and the only member of the wren family in the Old World, found in Eurasia and the Maghreb. It is 9 to 10cm long, with a wingspan of 13 to 17cm and a weight of about 10g. It is a plump, sturdy bird with a very short tail, often held cocked up, rounded wings and a relatively long thin bill, rufous brown above and greyer beneath, indistinctly barred (Wikipedia, general species account).

It is migratory in the northern, particularly north-eastern, parts of its range and sedentary in the west and south, and is highly polygynous, an unusual mating system for passerines. The scientific name means 'hole-dweller', referring to its habit of disappearing into cavities or crevices while hunting arthropods or roosting. The song is a gushing burst of sweet music, clear, shrill and emphatic. The account opened does not name Bhutan.