Shokhrin V.P., Kharchenko V.A., Maslov M.V., Glushchenko YU.N.
Amurian zoological journal 2023; 15(1): 119–129
The article discusses the nesting phenology of the Hazel Grouse Tetrastes bonasia in Primorsky Krai. Here, the nesting period lasts from the end of March to the end of July. Active spring courtship display was observed from the end of February to the beginning of April. Egg laying in some nests occurs as early as at the end of March, in mass - at the end of April and in May, while belated clutches were noted in July. Nest sizes (mm): diameter 120-240, tray diameter 110-170, tray depth 30-70. A complete clutch contains 7-14 eggs, 10.1 on average. Their parameters are: length (mm) 36.0-42.6, on average 38.15; diameter (mm) 27.1-30.9, on average 28.57; elongation index 63.8-83.3, on average 75.0; volume (cm3) 14.1-18.7, on average 15.9; weight (g) 13.4-16.4, on average 15.2. Hatching occurs in the second decade of May and in June. According to our data, a brood (n = 42) includes 1-16 young birds. Autumn courtship display begins in mid-August and continues until mid-November.
