The Michigan State University Museum (MSU) Mammal Research Collection includes more than 39,500 specimens, approximately 8,000 of which are from the Great Lakes region. Mexico, Chile, Argentina, and Ecuador are also well represented. The collection includes skeletons, study skins, skulls, tanned hides, frozen tissues, and fluid-preserved specimens.
The Ornithology Research Collection includes over 13,000 specimens; more than one third are from Michigan. Also well-represented are Mexico, Argentina, Colombia, Chile, and Brazil. Many of the specimens were part of the original holdings of the Michigan Agricultural College Museum, among them historically important series collected by naturalists Walter Barrows and Dillman S. Bullock. The collection includes study skins, skeletons, taxidermy mounts, eggs, nests, and fluid-preserved specimens.
The Vertebrate Paleontology Research collection includes over 4,200 specimens, approximately 90% of which are from North America. The most significant holdings are Cenozoic amphibians and reptiles from throughout North America, Permian fishes and tetrapods from Texas, and Late Pleistocene faunal remains from the Great Lakes region.