Grzimek's Student Animal Life Resource by Bernhard Grzimek
English | Dec. 2004 | ISBN: 0787692344 | 1044 Pages | PDF | 62.16 MB
The classification of animals into orders, families, and even species is not a completed exercise. As researchers learn more about animals and their relationships, classifications may change.
For this reason, the heading "Number of species" in the introduction of an entry may read "About 36 species" or "34 to 37 species." It is not a question of whether some animals exist or not, but a question of how they are classified. Some researchers are more likely to "lump" animals into the same species classification, while others may "split" animals into separate species.
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