The wolf, a male with black pelage, or fur, was identified as wolf #12 from the 1995 reintroduction in Yellowstone National Park.
Preliminary investigations have disclosed only that the wolf was killed illegally. The animal's carcass is currently being examined by scientists at the Service's National Wildlife Forensics Laboratory, Ashland, Oregon.
In announcing the reward today, Service wildlife law enforcement officials emphasized that information could be given anonymously and the caller would still be eligible to receive reward monies.
Anyone with information about the wolf's death may contact Fish and Wildlife Service Special Agent Roy Brown in Lander, Wyoming, at (307) 332-7607, or any Service Special Agent, as well as any law enforcement agent with the Wyoming Game and Fish Department.