Mystery surrounds death of 5 meerkats at Philadelphia Zoo.

The Philadelphia Zoo is investigating the sudden deaths of all five meerkats, which occurred within weeks of each other. The zoo suspects that an animal dye used for decades might be the cause of their deaths. The meerkats were siblings and came to the zoo in 2013. The zoo has stopped using the dye on all animals out of caution and is working with regulatory bodies on the investigation. The zoo staff is devastated by the loss of the animals.