Photo of Nevada mountain lion sparks 'Where's Waldo?' moment

Nevada's mountain lions often use the strategy of waiting patiently to ambush their prey. But as some can reach up to 180 pounds, the big cats are usually not too difficult to spot. Or are they?

Or are they? The U.S. Fish and Wildlife Service (UFWS) posted a photo on Facebook Tuesday, along with the caption: "Where's Waldo: Mountain lion in Washoe County, Nevada edition."