Oh my, those anomaly hunters are on the ball.
A new image from Mars Curiosity was scrutinized and guess what was found. (not really)
The website (webcited) has found a finger.
The image captures, what looks like a finger with nail. The NASA Mars Curiosity rovers wheels are 29.52 Inches wide, a human finger is about 3.5 inches the fossil finger appears to be roughly 5-6 Inches in length.
See it now. Yeah… you see what you want. Pareidolia!
UPDATE (21-Aug-2012): Gizmodo has this piece that describes even more –
dead pixels UFOs seen in pictures from Mars.