Passer montanus, commonly referred to as the Eurasian Tree Sparrow, is a small bird species belonging to the family Passeridae. In the Comunidad Valenciana, it is often known by its local name, Gorrión molinero.

This species is characterized by its compact body, short legs, and stout bill. The Eurasian Tree Sparrow measures about 12-14 centimeters in length, and its plumage features a distinctive chestnut-brown crown, black markings on the cheeks, and a small black bib on the throat.

• Habitat: The Eurasian Tree Sparrow is adaptable and can be found in a variety of habitats, including woodlands, farmlands, and urban areas. They are frequently seen in parks and gardens within the Comunidad Valenciana.
• Diet: Their diet mainly consists of seeds and grains, but they will also consume insects, especially during the breeding season when the nutritional demand is higher.
• Behavior: These birds are social creatures, often seen foraging in small flocks. They are known for their cheerful chirping and can be observed forming roosting groups during the colder months.
• Nesting: The Eurasian Tree Sparrow typically builds its nests in tree holes, but is also known to use buildings and nest boxes. The nests are constructed from twigs, grass, and feathers to provide a secure environment for their eggs and chicks.

The Eurasian Tree Sparrow is a familiar and resilient species, contributing significantly to the avian diversity of the Comunidad Valenciana.