The Hot Springs Mammoth Site, South Dakota, USA, has been excavated for over three decades, during which time numerous body fossils have been recorded. The site is particularly well known for the skeletal remains of mammalian megafauna. Bedding plane surfaces were studied that displayed the first record of small vertebrate (avian) and invertebrate traces. While large vertebrate tracks, often observed in cross-section, are well known at the site, the new traces form a hitherto unstudied assemblage. The presence of distinct didactyl and tridactyl avian tracks from the site are described here for the first time. The small (∼20 mm long) tracks and associated invertebrate traces suggest relatively high moisture content in the substrate on surfaces that experienced aerial or subaerial exposure. This is consistent with the interpretation that the upper layers of the site represent the latter stages of a sinkhole setting with a pond undergoing cyclical drying out.