An image of two lynx spotted in southwest Colorado posted Wednesday on the Colorado Parks and Wildlife Facebook page had more than 6,000 likes by midday Thursday.
The department said that a retired National Park Service employee took the photo the weekend of Jan. 19-20.
Colorado's native lynx died out in the early 1970s because of trapping, poisoning and development.
The state Division of Wildlife began reintroducing them in the San Juan Mountains of southwest Colorado by releasing lynx that were captured in Alaska and Canada.
By 2006, 218 lynx had been brought in and equipped with tracking devices on collars so researchers could monitor their movements.
The first kittens born to the transplanted lynx were documented in 2003, and third-generation cats were first found in 2006.