While we humans have topped 7000 million there may be less than 500 left of our fellow primate, the Silky Sifaka.
Q&A with Erik Patel
About how many Silky Sifakas do you estimate remain in the wild?
Patel: Silky sifakas are one of the rarest animals on earth and it is shocking to consider how few remain.
Over the past few years, our team has found 31 groups (131 total individuals) of silky sifakas in Marojejy National Park which contains the majority of their remaining population.
None at all are found in captivity because they have never survived in zoos anywhere.
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http://news.mongabay.com/2011/0120-silky_sifakas.html