Officials investigating deaths of at least 5 meerkats at Philadelphia Zoo

PHILADELPHIA (CNN) — The Philadelphia Zoo says at least five meerkats have died this month.

Zookeepers are looking into whether a dye used to mark the animals could be a factor, but the chief experience officer says it's been using that substance for 30 years on meerkats.

She says experts from the Association of Zoos and Aquariums and U.S. Agriculture Department are helping to investigate.

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