Troglodytes troglodytes, commonly known as the Eurasian wren, is native to the Palearctic region. Its geographical distribution includes Europe, North Africa, and Asia, extending east to the Himalayas and western China. Notably, it is also present in the UK, Ireland, and the coastal regions of the British Isles.

The Eurasian wren typically inhabits temperate regions. It is found in a variety of environments, including forests, woodlands, gardens, and scrublands. The species prefers areas with dense undergrowth or thick ground cover, which provide shelter and ample foraging opportunities.

The Eurasian wren plays an important role as an insectivore, feeding primarily on insects and spiders. Its small size and agility allow it to forage in dense vegetation and pick insects from leaf litter and bark. The bird's song is a characteristic feature used for territory establishment, particularly in breeding season.