YOU have the eyes of a hawk if you can spot the secretive goat on this rocky hillside within ten seconds. This mind-bending optical illusion has gone viral online and left most puzzlers dumbfounded.

The image shows a rocky cliff face or hillside, showcasing layered, stratified rock formations. At first glance, it may appear like just another picturesque landscape, but look closely.

On a rocky hillside in Fort Collins, Colo., is a "mega den" of hundreds of rattlesnakes. They live between the rocks year-round, but in the summer, the only snakes to remain in the area are ...