More than 100 hippos have died in Namibia after they are believed to have contracted anthrax. Rangers at Bwabwata National Park say 109 of the animals have perished since Sunday last week as pictures show dozens of bloated bodies floating in murky water. While the exact cause of the deaths is not clear, workers believe it could be down to an anthrax outbreak, which is caused by bacterial spores that occur naturally. Veterinarians still need to confirm the cause, and say the death toll could be higher because vultures and crocodiles have been eating the remains. Government officials estimated that Namibia’s hippo population was around 1,300 before the mass death.