- http://www.sdnhm.org/archive/exhibits/mystery/fg_giantsloth.html
- http://www.uiowa.edu/~nathist/slothsite/
- http://www.nhm.ac.uk/nature-online/species-of-the-day/collections/our-collections/megatherium-americanum/index.html
- http://www.nytimes.com/2014/01/28/science/the-sloths-busy-inner-life.html?_r=0
- http://www.srl.caltech.edu/personnel/krubal/rainforest/Edit560s6/www/animals/slothpage.html