A murder probe had been launched after Stepan Ludannyi went missing.
WWF starts project to breed Amur leopards and released them in the wild.
Russian scientists hopeful of finding traces of cosmic matter left after the explosion.
North Korea urged to join Russia and China in fixing reliable numbers for Amur big cats.
Zoo discovers big cat's secret talent rolling snow to make winter toys.
Remarkable story of the rare big cat that sought out human help with a severe dental problem.