The Eurasian tree sparrow (Passer montanus) is a small bird commonly found across Europe and Asia. It has a distinctive brown cap, white cheeks, and a black spot on its throat. These birds typically inhabit urban areas, farmlands, and gardens, where they often forage for seeds and insects. Eurasian tree sparrows are social creatures, often seen in flocks. They build their nests in tree cavities, buildings, or shrubs, using grass and feathers. Their cheerful chirping and adaptability make them a familiar sight in many regions, contributing to their status as a common species in their range.