Aegithalos caudatus, commonly known as the Long-tailed Tit, is native to the temperate regions of Europe and Asia. It can be found across a wide range stretching from Western Europe, including the UK and Spain, to Eastern Asia, including Japan and parts of China.

The Long-tailed Tit typically inhabits deciduous and mixed woodlands, forest edges, and scrublands. They prefer areas with dense undergrowth and a variety of shrubs and small trees where they can nest and forage. The species thrives in mild to temperate climates and is often found in regions with seasonal variations, including cold winters and warm summers.

Aegithalos caudatus primarily feeds on insects, spiders, and other small invertebrates, making it an important part of the ecosystem as both a predator and a prey species. During winter months, their diet can expand to include seeds and other plant materials. They play a role in controlling insect populations and are known for their complex social behaviors, often forming large, cooperative flocks especially outside the breeding season.