A rare species of tiger in Russia has been succumbing to canine distemper virus, which may be responsible for at least 1% of the big cats' deaths. Pathologists at the Wildlife Conservation Society in New York studied tissue samples from five wild Amur, or Siberian, tigers that died from a neurological disease, and found that the distemper virus killed two of the animals, and was present in a third. "Losing 1% of an endangered population is pretty significant," said Denise McAloose, a researcher on the study.

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