The Colorado State University Biology Collection contains mammals, birds, reptiles, and amphibians. These are primarily Colorado species, and primarily collected in Colorado and surrounding states. There are a few exotic specimens but these are in the minority. Most of the collection is from the mid 1900s but ranges from the 1880s to current day. The majority of the birds and mammals are study skins and skulls. The majority of the herps are fluid preserved. The collection also contains a variety of other specimen types (e.g. bacula, fluid-preserved organs, articulated skeletons, etc).