Albert Einstein's theory of relativity is actually two separate theories: his special theory of relativity , postulated in the 1905 paper, The Electrodynamics of Moving Bodies and his theory of general relativity , an expansion of the earlier theory, published as The Foundation of the General Theory of Relativity in 1916.
Timber or Grey Wolf. Once the world's most widely distributed mammal, the grey wolf has become extinct across much of its former range and its present distribution is much restricted. Grey Wolf (Canis Lupus), Carpathian Mountains, Romania.
The close of the Ice Age led to the Quaternary extinction event with its loss of mainly large animals that are referred to as Pleistocene megafauna. It is proposed that with the loss of this prey the Beringian wolf also went extinct.