What Is The Lightest Species Of Mammal. If a species belongs to the mammals, then all members of that species are mammals. The status of mammal or not doesn't depend on the individual.
To begin with, mammal species are in the Class Mammalia, within the Subphylum Vertebrata, under the Phylum Chordata, in the Kingdom Animalia. If a species belongs to the mammals, then all members of that species are mammals. The other extant (living) classes of vertebrates (animals with backbones) include fish (with a few recognized classes).
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Most mammals have external ears - but not all have ears as big as those of the fennec fox!
Yet the continued steady flow of taxonomic changes proposed in peer-reviewed journals and books. Nucleotide substitutions in a gene occur at a. Yes - but so are Insects, Reptiles, Spiders, Sponges and Slugs.