Glossotherium robustus Eremotherium laurillardi
Original description of M. robustus What giant beasts carved out these South American mega-tunnels? (both)
Glossotherium summary – Wikipedia Range of E. laurillardi– Wikipedia
Fossil evidence of frequency E. laurillardi: The Panamerican late Pleistocence megatheriid sloth
range of hearing independent of Carbon idsotope in tooth enamel of Pleistocene mega mammals-abstract