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The Giraffidae are a family of ruminant artiodactyl mammals that share a recent common ancestor with deer and bovids.This family, once a diverse group spread throughout Eurasia and Africa, presently comprises only two extant genera, the giraffe (between one and eight, usually four, species of Giraffa, depending on taxonomic interpretation) and the okapi (the only known species of Okapia).
Some biologists suggest the modern giraffes descended from G. jumae; [10] others find G. gracilis a more likely candidate. G. jumae was larger and more robust, while G. gracilis was smaller and more slender. [6] The changes from extensive forests to more open habitats, which began 8 mya, are believed to be the main driver for the evolution of ...
The IUCN currently recognizes only one species of giraffe, with nine subspecies, one of which is the Nubian giraffe. [1] The Nubian giraffe, along with the whole species, were first known by the binomen Cervus camelopardalis described by Swedish zoologist Carl Linnaeus in the Systema Naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis ...
Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection, although Lamarckism was also included as a mechanism of lesser importance. The book presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution.
The accompanying book, The Life of Mammals by David Attenborough (ISBN 0-563-53423-0), was published by BBC Books on 17 October 2002. Both DVD and book have been translated to other languages. The Dutch version of the DVD produced by Evangelische Omroep removed all references to (amongst others) evolution, fossils, and continental drift. [3]
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In addition, Rothschild's giraffe displays no markings on the lower leg, giving it the impression of wearing white stockings. [2] Another distinguishing feature of Rothschild's giraffe, although harder to spot, is the number of ossicones on the head. This is the only Giraffa phenotype to be born with five ossicones. Two of these are the larger ...
The current IUCN taxonomic scheme lists one species of giraffe with the name G. camelopardalis and nine subspecies. [1] [7] A 2021 whole genome sequencing study suggests the northern giraffe as a separate species, and postulates the existence of three distinct subspecies, [8] and more recently, one extinct subspecies.