A cotton-top tamarin is a very small primate on the endangered species list. According to a KPLC TV story there are only 7,800 left in the world. Two of them died at the Alexandria zoo this past Wednesday.

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The zoo said the deaths appear to be "human error" after the animals were left out in the cold. The caretaker responsible is no longer caring for animals and has been placed on administrative leave. The incident is under investigation. The animals are native to Columbia and normally live to be about 13 years old.According to the Town Talk the cotton-top, or cotton-headed, tamarin is one of the world's smallest primates and is easily recognized by its fan of long, white hair on its head