Katz Alexey V. RussiaMoscowAgrarian-Technological Institute, RUDN University, 8/2 Miklukho-Maklay St., Moscow 117198, Russiaalexey-katz@yandex.ru Author's articles On findings of colour anomalies in the moor frog Rana arvalis Nilsson, 1842 (Ranidae, Amphibia) in the Moscow region