Eurasian Tree SparrowPasser montanus
The most characteristic feature of this species is the black spot on the cheek that no other sparrow has. The crown and back of the head are completely brown, the belly is lighter.
It is distributed along the shores of the Atlantic to the Pacific; later introduced in North America, Australia, the Philippines and several other islands. It occurs throughout the country with exception of the mountain’s highest parts.
The tree sparrow begins to build a nest already in mid-March in tree hollows, holes, pillars, old nests of swallows, cavities in buildings, fences and utility poles. The species prefers to stay in small colonies. It lays 2-8 eggs, which hatch after 11-14 days. The small ones learn to fly after 15-20 days, resulting in 2-3 new generations per year in April to July.