El Punto Critico – Tulum’s network of underground rivers, caves and caverns are one of the world’s most important paleontological sites. Most recently, giant sloths, which are very rare, were detected.

http://www.elpuntocritico.com/noticias-cultura/121640-resguarda-tulum-yacimientos-paleontol%C3%B3gicos-valiosos.html