Alaskan Wolves - Wiped Out 12,000 Years Ago

They can now be added to the list of mammals that became extinct for some unknown reason (but me thinks the last cataclysm) 12,000 years ago in North America.

"Wolves were generally thought to have survived the end-Pleistocene extinction relatively unscathed. But this previously unrecognized type of wolf appears to have vanished without a trace some 12,000 years ago.

...The result implies that the Alaskan wolves died out completely, leaving no modern descendents. After the extinction, the Alaskan habitat was probably recolonized by wolves that survived south of the ice sheet in the continental United States, Leonard said."