Being a sniper is more than just having good aim. In this new photo series by German artist Simon Menner, snipers have to go the extra mile when out on a job. They have to be invisible. Can you spot them in these pictures?

These sharpshooters prove to be difficult to spot as they are covered in moss, buried under twigs and branches and more. Check out the gallery below and see where Liu Bolin gets his inspiration from.