Aspects of this topic are discussed in the following places at Britannica.
...the back, light gold on the hindquarters, and black on the crown and nape. The black, or Perrier’s, sifaka (P. perrieri) lives in the dry northwestern highlands of Ankarana, and the golden-crowned, or Tattersall’s, sifaka (P. tattersalli), first described scientifically in 1988, lives only in the Daraina region of the northeast. Both species are critically...
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