Looks like plaster art, I need more sources. no opposable thumbs... http://www.disclose.tv/news/new_alien_mummy_discovered_near_nazca_lines/139403
http://www.bbc.co.uk/history/ancient/egyptians/mummies_01.shtml BCC dose not talk about the 3 digit appendage at all when referencing nazca mummy, looking fake.
spider monkeys are know not to have thumbs but are 4 digited, their feet have 5 digits though. the spider money skull dose appear elongated, like this mummy's skull, however the spider monkey has a deeper eye sockets. Additionally their digits stick to standard of 4 bones to mammals hands, unlike the mummy that contains 6. The x-ray scans of some of these nazca mummy hands look little hodgepodge to me. Fake until proven other wise.
Are there Aliens/alien life? yes likely. universe is huge. have they visited earth? no, unlikely. universe is huge. Are sources claiming a mummy is ALIEN without doing proper research reliable? Firk no. are you drunk?