McCarroll, S. M. and J. L. Dobie.  1994.  Additional Pleistocene mammals from Bogue Creek, Dallas County, Alabama.  Journal of the Alabama Academy of Sciences, 65(1): 16-27.

McCrane, M. P.  1966.  Birth, behavior and development of a hand reared two-toed sloth, Choloepus didactylus.  International Zoo Yearbook, 6: 187-189.

McDaniel, G. E., Jr., G. T. Jefferson and H. G. McDonald.  2001.  A large Paramylodon harlani osteoderm layer from the Irvingtonian of Anza-Borrego Desert State Park, California.  Journal of Vertebrate Paleontology, 21(3, Suppl.): 79.

McDonald, H. G.  1977.  Description of the osteology of the extinct gravigrade edentate Megalonyx with observations on its ontogeny, phylogeny and functional anatomy.  Master's Thesis, University of Florida (Unpublished): 328 pp.

-------- 1985.  The Shasta ground sloth Nothrotheriops shastensis (Xenarthra, Megatheriidae) in the Middle Pleistocene of Florida; pp. 95-104 In G. G. Montgomery (ed.), Evolution and Ecology of Armadillos, Sloths, and Vermilininguas.  Smithsonian Institution Press, Washington, D.C.

-------- 1987.  A systematic review of the Plio-Pleistocene scelidotheriine ground sloths (Mammalia:  Xenarthra:  Mylodontidae).  Ph.D. dissertation, University of Toronto.  Toronto, Canada, 499 pp.

-------- 1992.  Chester's sloths; the ground sloths of Rancho La Brea.  Terra, 31(1): 32-33.

-------- 1993.  Harlan's ground sloth, Glossotherium harlani, from Pauba Mesa, Orange County, California.  San Bernardino County Museum Association Special Publication, Ashes, Faults and Basins, 93(1): 101-103.

-------- 1995.  Gravigrade xenarthrans form the middle Pleistocene Leisey Shell Pit 1A, Hillsborough County, Florida.  Bulletin of the Florida Museum of Natural History Biological Sciences, 37 Pt. II(11): 345-373.

-------- 1996.  Biogeography and paleoecology of ground sloths in California, Arizona and Nevada.  San Bernardino County Museum Quarterly, 43: 61-65.

-------- 2006.  Sexual dimorphism in the skull of Harlan's ground sloth.  Contributions in Science, Natural History Museum of Los Angeles County, 510: 1-9.

McDonald, H. G. and D.C. Anderson.  1983.  A well-preserved ground sloth (Megalonyx) cranium from Turin, Monona County, Iowa.  Proceedings of the Iowa Academy of Sciences, 90: 134-140.

-------- and C. E. Ray.  1990.  The extinct sloth, Megalonyx, (Mammalia:  Xenarthra) from the United States Mid-Atlantic continental shelf.  Proceedings Biological Society Washington, 103: 1-5.

--------, L. D. Agenbroad and C. A. Manganaro.  1994.  Mylodont sloth in northern Arizona.  Journal of Vertebrate Paleontology, 14(3, Suppl.): 37.

-------- and C. de Muizon.  1995.  An aquatic sloth from the Pliocene of Peru: another group of mammals returns to water.  Journal of Vertebrate Paleontology, 15(3, supplement): 42.

--------, W. E. Miller and T. H. Morris..  2001.  Taphonomy and significance of Jefferson's ground sloth (Xenarthra: Megalonychidae) from Utah.  Western North American Naturalist, 61(1): 64-77.

-------- and C. de Muizon.  2002.  The cranial anatomy of Thalassocnus (Xenarthra, Mammalia), a derived nothrothere form the Neogene of the Pisco Formation (Peru).  Journal of Vertebrate Paleontology, 22(2): 349-365.

--------, L. D. Agenbroad and C. Manganaro Haden.  2004.  Late Pleistocene mylodont ground sloth Paramylodon harlani (Mammalia: Xenarthra) from Arizona.  The Southwestern Naturalist, 49: 229-238.

-------- and S. Pelikan.  2006.  Mammoths and mylodonts: Exotic species from two different continents in North America Pleistocene faunas.  Quaternary International, 142-143: 229-241.

McNab, B. K.  1985.  Energetics, population biology, and distribution of xenarthrans, living and extinct; pp. 219-232 in G. G. Montgomery (ed.), The Ecology and Evolution of the Armadillos, Sloths, and Vermilinguas.  Smithsonian Institution Press, Washington D. C.