Small mammal

The International Biological Programme has defined small mammals as species weighing up to 5 kg.

[1][2][3] Alternatively, the International Union for Conservation of Nature (IUCN) groups the orders of rodents, tree shrews and eulipotyphlans (insectivores) together under the term small mammals.

[1][2] They are found in a great range of habitats and climate zones.

Their small size, together with frequently nocturnal or crepuscular activity, provide some protection against predators.

[3] 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.