Семенов-Тян-Шанский О.И. Экология тетеревиных птиц. Москва, 1959.

50. Seasonal alternations of Tetrastes bonasia body weights. 51. Seasonal alternations of Lagopus lagopus body weights. 52. Moulting diagram of primaries and secondaries feathers in Capercaillie juveniles (males). 53. Moulting diagram of primaries and secondaries feathers in Capercaillie juveniles (females). 54. Moulting diagram of primaries and secondaries feathers in Capercaillie adults; solid arrows — male feathers in state of growth, break-off arrows — those of females. 55. Moulting diagram of primaries and secondaries in Willow Grouse adults; thin arrows indicate white feathers, thick arrows — coloured secondary feathers. 56. Moulting diagram of primaries and secondaries in Willow Grouse juveniles. For explications see fig. 55. 57. The structure of Capercaillie female tail from above and from behind. 58. Wing’s end of an immature Capercaillie female. Primaries NN 1 and 2 are pointed, tops light-spotted. 59. Primaries feathers of Willow Grouse, juvenile (left) and adult (right). The primary N 2 of juvenile bird is at the top pointed, black-spotted. 60—63. Skulls of Capercaillie males from the side. Note the course of processus postorbitalis posterior and proc. zygomaticus joining together. Fig. 60 — 1 year old, 61 — 2 years, 62 — 3 years, 63 — 4 years or more. 64—67. Skulls of Capercaillie males from above. Note the course of oo. nasalia and oo. frontalia joining together. Fig. 64 — 1 year old, 65 — 2 years, 66 — 3 years, 67 — 4 years or more. 68 . Mandibulae of Capercaillie males, 4 years old (above) and 3 years old (below). Note the seam between os dentale and os angu- lare filling up. 69. Seasonal changes in Ascaridia invasion of Capercaillie and Willow Grouse. Solid line — in Lapland Reserve, dash-and dot- line — in Norway, dash line — in Petshora-Ylytsh Reserve. 70. Seasonal changes in Gestoda invasion of Capercaillie and Willow Grouse. For explications see fig. 69. 71. Number of Goshawks met in a year (dash line) and of Tetraonids met during one hunting day (solid line); both in Lapland Reserve. 72. Golden eagles claw (Aquila chrysa§tus). 73. Golden eagles aerie in Lapland Reserve. 74. Food composition of marten in Lapland Reserve in summer. Explications: in broad columns, from above — berries (circles), insects (cross hatched), frogs (dotted), eggs (white), various birds (vertical hatched), Tetraonids (sparse hatched), various mammals (oblique hatched), voles and shrews (sparse hatched). Black arrow columns — census indices of voles and shrews. 20* 307