This is probably not due to ET visitors in the past. Like the other Nazca lines in the area, they're more likely drawn by ancestral tribes in the area who were marking territories to show their homeland or ancestral origins.
https://www.yahoo.com/news/m/a30b3a5d-5f58-33f5-89ac-056c8fdaec34/ss_massive-new-drawings-revealed.html https://www.yahoo.com/news/m/a30b3a5d-5f58-33f5-89ac-056c8fdaec34/ss_massive-new-drawings-revealed.html
