Among the monuments, the heritage sites, the burial plots and the petroglyphs that Mongolia boasts of, the deer stones, also popular as the reindeer stones are much popular. The deer stones of Mongolia are known to hail back to the prehistoric Iron and Bronze Age and they are named so, primarily for the deer motif engraved on them. Many fascinating tales and theories are attached with these stone structures and they are often spotted with monuments locally termed as Khirgisuur.