New research reveals that extinct giants are among the animals shown in an 8-mile-long (13-kilometer-long) frieze of rock paintings at Serrana de la Lindosa in the Colombian Amazon jungle — art created by some of the region’s oldest humans. Early humans may have come across the giant beasts and painted them in a naturalistic manner that emphasizes the animals’ noticeable physical features, according to study author and university professor Jose Iriarte. However, the discovery of “extinct megafauna” among the beautiful paintings is uncertain. While Iriarte acknowledges that the new research does not confirm this theory, he believes they have evidence of early human contact with some of the world’s vanished giants. The five animals discovered in the study are: a giant ground sloth with massive claws, a gomphothere (an elephant-like creature with a domed skull, flared 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.