As evidence, fans of the alien theory point to some of the more unusual Nazca biomorphs — the name for the etchings that depict forms found in nature, like humans, insects, birds, fish ...

in Nazca, Peru. The team from Yamagata University said the images of humans, camels, birds, killer whales, cats, snakes and other animals were likely created around 100 B.C.–A.D. 300.