New study reveals that extinct giants are among the species shown in an 8-mile-long (13-kilometer-long) frieze of rock paintings at Serrana de la Lindosa in the Colombian Amazon jungle — art made by some of the region’s oldest humans. “(The paintings) have the whole diversity of Amazonia. Turtles and fishes to jaguars, monkeys and porcupines,” said study author Jose Iriarte, a professor at the University of Exeter’s Department of Archaeology. He further explains that early humans may have come across these large-bodied beasts and painted them in a naturalistic way that shows the visible morphological traits of the animals.

But the discovery of “extinct megafauna” among the gorgeous paintings remains debatable. While Iriarte admits that the new research does not prove this theory, he is confident that they have discovered evidence of early human contact with some of the world’s disappearing giants. The five animals identified in the research are: a large ground sloth with massive claws, a gomphothere (an elephant-like creature with a domed skull, flaring ears, and a trunk), an extinct lineage of the horse with a thick neck, a camelid like a camel or a llama, and a three-toed ungulate with a trunk.