An Amur tiger, also known as a Siberian tiger, tests the waters in Russia Tamim Ridlo/Shutterstock Tigers Between EmpiresJonathan C. Slaght, Allen Lane (UK); Farrar, Straus and Giroux (US) The Siberian tiger is an awesome animal, with “cuts of black and washes of orange”, writes conservationist Jonathan Slaght, a roar like “some terrible tide”, at home in the bitter…