What is the rarest animal in the world? See the list of top 10 most endangered species.
Wash ashore: Officials say this could be world's rarest whale species Here are the top 10 species in the “critically ...
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5 Rarest Gemstones in the World, Rarer than Diamonds
However, most fine specimens are carefully preserved by mineral collectors and rarely faceted. The dazzling gemstone Benitoite flawlessly completes the list of the world's rarest gemstones. Found only ...