A Nile hippopotamus believed to be the oldest in North America has died at an Ohio zoo.
The Cleveland Metroparks Zoo says the male hippo was euthanized Monday due to ``advanced age-related ailments.'' The zoo says the hippo was named Blackie and was about 59 years old.
A zoo announcement says Blackie sired three male offspring after arriving at the zoo from Africa in 1955. Blackie was born in a game sanctuary in Tanzania.
The zoo says hippos typically live 30 to 40 years in the wild and can live longer in captivity.