Small mammals ormicromammals are a subdivision ofmammals based on their body mass and size. Different values have been used as the upper limit. TheInternational Biological Programme has defined small mammals as species weighing up to 5 kg.[1][2][3] Alternatively, theInternational Union for Conservation of Nature (IUCN) groups the orders ofrodents,tree shrews andeulipotyphlans (insectivores) together under the term small mammals.[4]
A significant majority of mammal species falls into the category of small mammals.[1][2] They are found in a great range of habitats and climate zones.[3]
Many small mammals have a short livespan and high fertility rate, resulting in a comparatively high variability in genetic composition. Their size leads to a reduced energy need for movement, but a high energy requirement for maintaining body temperature. This results in a high rate of food intake, using a wide range food sources. Their small size, together with frequently nocturnal orcrepuscular activity, provide some protection against predators.[3]
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The tree shrews (family Tupaiidae) are non-rodent, primate-like animals and are classified into the order Scandentia. They are subdivided into two subfamilies: the diurnal subfamily Tupaiinae with five genera (Tupaia, Anathana, Dendrogale, Lyonogale, Urogale) and the nocturnal subfamily Ptilocercinae with a single genus, pen-tailed tree shrew Ptilocercus
The SSC Small Mammal Specialist Group (SMSG) of the IUCN "serves as the global authority on the world's small mammals" both with regard to research as well as conservation efforts.[5]
Cao, J., Li, J. S. Y., & Chow, P. (2003, May 6). The tree shrews: adjuncts and alternatives to primates as models for biomedical research. Wiley Online Library.https://onlinelibrary.wiley.com/doi/abs/10.1034/j.1600-0684.2003.00022.x
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