The Subspecies of the Mexican Red-Bellied Squirrel, Sciurus aureogaster

"The Subspecies of the Mexican Red-Bellied Squirrel, Sciurus aureogaster" by Keith R. Kelson is a scientific analysis from the 1950s which examines the different types of the Mexican red-bellied squirrel by looking at their body structures and where they live. Written for experts, the publication adds to the knowledge of mammals and tries to make sense of how these squirrels are classified. Kelson goes over past classifications by important squirrel scientists and shares what he learned from studying 256 squirrel samples from where they live geographically. He looks at changes in color and skull shape among three types of the squirrel, questioning old ideas and suggesting that two of the types, "Sciurus aureogaster hypopyrrhus" and "Sciurus aureogaster frumentor", might not be different enough to be separate because they look similar and live in the same areas. In the end, Kelson thinks the classification should be simpler, saying that many of the smaller groups that were identified before are actually just variations within the main group of "Sciurus aureogaster".