Birds population of the Gryaznaya River upstream basin (Leopard Land National Park)
In March-July 2019, the avifauna of the Gryaznaya river basin within The Land of Leopard National Park was studied. 73 bird species were recorded in the surveyed area; the total bird population density was 184.6 individuals/sq.km in March, in April - 447.1 individuals/sq.km, and in May - 501.4 individuals/sq.km. In early March Marsh Tits (58.58 individuals/sq.km), Eurasian Nuthatches and Long-tailed Tits dominated; in April Eurasian Nuthatches (51.08 individuals/sq.km), Eastern Great Tits and Yellow-throated Buntings; in May Eastern Crowned Leaf-warblers (52.15 individuals/sq.km), Eastern Great Tits and Asian Stubtails. The largest part of the spring avifauna of the Gryaznaya river basin was represented by the orders Passeriformes (45 species or 62.0%), Falconiformes (7 species or 9.6%), Piciformes and Strigiformes (4 species or 5.5%).