The Romans identified satyrs with their own nature spirits, fauns. Although generally similar to satyrs, fauns differed in that they were usually seen as "shy, woodland creatures" rather than the drunk and boisterous satyrs of the classical Greeks. Also, fauns generally lacked the association Greek satyrs had with secret wisdom. Unlike classical Greek satyrs, fauns were unambiguously goat-like; they had the upper bodies of men, but the legs, hooves, and horns of goats. The first-century BC Roman poet Lucretius mentions in his lengthy poem "De rerum natura" that people of his time believed in "goat-legged" (""capripedes"") satyrs, along with nymphs who lived in the mountains and fauns who played rustic music on stringed instruments and pipes.