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Quandt, SKF and JW Nesbit. 1992. Disseminated histoplasmosis in a two-toed sloth (Choloepus didactylus). Journal of Zoo and Wildlife Medicine 23(3): 369-373.


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Rappaport, AB and H Hochman. 1988. Cystic calculi as a cause of recurrent rectal prolapse in a sloth (Choloepus sp.). Journal of Zoo Animal Medicine 19(4): 235-236.

Ratcliffe, BC. 1980. New species of Coprini (Coleoptera: Scarabaeidae: Scarabaeinae) taken from the pelage of three-toed sloths (Bradypus tridactylus L.) (Edentata: Bradypodidae) in central Amazonia with a brief commentary on scarab-sloth relationships. Coleopterists Bulletin 34(4): 337-350.

Rautenberg, M. 1906. Veber Pseudolestodon hexaspondylus. Paleontographica 53: 1-51.

Redmond, BG, HG McDonald, HJ Greenfield and ML Burr. 2012. New evidence for Late Pleistocene human exploitation of Jefferson's ground sloth (Megalonyx jeffersoni) from northern Ohio, USA. World Archaeology 44(1): 75-101.

Rega, E, DA McFarlane, J Lundberg and K Chirstenson. 2002. A new Megalonychid sloth from the late Wisconsinan of the Dominican Republic. Caribbean Journal of Science 36(1-2): 11-19. (type description: Acratocnus simorhyncus)

Reinhardt, JT. 1875. Bidrag til Kundskab om Kæmpedovendryret Lestodon armatus. Videnskavernes Selskabs Skrifter. 5 Raekke. Naturvidensakbelig og Mathematisk Afdeling 11(1): 1-39.

––– 1878. Kæmpedovendyr-Slaegten Coelodon. Videnskavernes Selskabs Skrifter. 5 Raekke. Naturvidensakbelig og Mathematisk Afdeling 12(3): 257-335. (type description, Nothrotherium escrivanense)

––– 1879. Beskrivelse af Hovedskallen af et Kæmpedovendyr, Grypotherium darwinii. Videnskavernes Selskabs Skrifter. 5 Raekke. Naturvidensakbelig og Mathematisk Afdeling 12(4): 351-381.

Rensenbrink, HP. 1980. Sloth. Artis (Amsterdam) 26(2): 65-71.

Resar, NA, JL Green and RK McAfee. 2013. Reconstructing paleodiet in ground sloths (Mammalia, Xenarthra) using dental microwear analysis. Kirtlandia 58: 61-72.

Reynolds, R.E. 1995. The long outreach of the Devil Peak sloth. Quarterly of San Bernardino County Museum Association 42(2): 41.

Richard-Hanssen, C and E Taube. 1997. Note on the reproductive behavior of the three-toed sloth, Bradypus tridactylus, in French Guiana. Mammalia 61(2): 259-263.

–––, N Bello and J Vié-Christophe. 1998. Tool use by a red howler monkey (Alouatta seniculus) towards a two-toed sloth (Choloepus didactylus). Primates 39(4): 545-548.

Riecker, RE and TP Rooney. 1968. Deformation and polymorphism of enstatite under shear stress; a possible earthquake mechanism. Special Paper - Geological Society of America: 177-178.

Ridgewood, WG. 1901. On the structure of the hairs of Mylodon listai and other South American edentates. ??  44(3): 393-410.

Robertson, JS. 1976. Latest Pliestocene mammals from Haile XV A, Alachua County, Florida. Bulletin of the Florida State Museum 20(3): 111-186.

Rogers, RA and LD. Martin. 1985. Early projectile points and Pleistocene fauna from sandpits near Wichita, Kansas. Transactions of the Kansas Academy of Science 88(1-2): 46-50.

Rojas, P and SJ Carbonell. 1932. Notas de paleohistología dentaria. Extructura de los dientes del Octodontotherium crassidens Ameghino. Archivos de la Sociedad de Biología de Montevideo 7: 1877-1979.

Rossoni, RB, CRS Machado and ABM Machado. 1981. Autonomic innervation of salivary glands in the armadillo, anteater, and sloth (Edentata). Journal of Morphology 168(2): 151-157.

Roth, S. 1899. El Mamifero misterioso de la Patagonia, "Grypotherium domesticum." II. Descripción de los restos encontrados en la caverna de Última Esperanza. Revista del Museo de La Plata 9: 421-453.

––– 1904. Nuevos restos de mamíferos de la caverna Eberhardt en Última Esperanza. Revista del Museo de La Plata 11: 37-53.

––– 1911-12. Un nuevo genéro de la familia "Megatheriidae" Pleisomegatherium Hans-Meyeri. Revista del Museo de La Plata 18(5): 7-21. (type description, Pleisomegatherium)

Roverto, C. 1914. Los estratos araucanos y sus fósiles. Anales del Museo Nacional de Historia Natural de Buenos Aires 25: 1-247, pls. 1-31.

Ruez, D.R. Jr. 2005. Diet of Pleistocene Paramylodon harlani (Xenarthra: Mylodontidae): Review of methods and preliminary use of carbon isotopes. Texas Journal of Science, 57(4): 329-344.

Rusconi, C. 1935. Nueva subespecie de Glossotherium (Edentata). Ameghiana 1(5-6): 162-171.

––– 1938. Sobre ejemplares juveniles del genero Scelidotherium. Anales de la Socidad Cientifica Argentina 126: 33-40.

Ryder, JA. 1879. A remarkable new species of ground sloths. American Naturalist: 590-592.

––– 1879. A new species of Coelodon. American Naturalist: 592.