***THIS POST WAS WRITTEN YEARS AGO. AN UPDATED, HIGHER-QUALITY VERSION HAS NOW BEEN POSTED. YOU CAN FIND IT AT THE LINK BELOW.***
Bergman's Bear is/was a large bear species found in the Kamchatka region of Russia. Due to its huge size, some locals also call it the "God Bear." In 1920, a biologist heard tales of this large bear, and he obtained a set of footprints and a hide. He determined that this was indeed a new species, since its fur was so different from all local bears and since its footprints were so muhch bigger. No reports came in for years afterwards, and the bear was presumed extinct. However, in the 1960s, reports started coming in again from locals. Some think that the population recovered during the Cold War, when no outsiders were allowed into Kamchatka. This cryptid may be a subspecies of the also-huge grizzly bear, although due to the differences in fur type it is most likely a new species alltogether. If it exists today it is undoutably very rare.
Image (public domain) from http://upload.wikimedia.org/wikipedia/commons/3/3f/Brown-bear-in-spring.jpg