Ice (L), a three-year-old female North American cougar, and its four-month-old cub leave their den in the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, February 11, 2016. Ice and another cougar Arnaldo, who were both born at the zoo, gave birth to two cubs, according to employees. REUTERS/Ilya Naymushin