We were on a tour of an ancient archeological site near Lima, Peru. It is a drab, sandy area. Several of us saw a bone on the ground (shown). I did not think much of it until one of our party asked what was on the ground next to bone. It took me several seconds to see what she was referring to. This fairly large bird is a master at camouflage. They rest motionless during the day and forage at nighttime.
These photos were taken with a telephoto lens with a limited depth of field to bring out the bird. To the unaided eye, they are difficult to see. The Peruvian Thick-knee.