Nadi was one of 3 northern white rhinos at the zoo's Wild Animal Park. No cause of death was given, but the female rhino had shown signs of old age.

Nadi was more than 40 years old. The rhino was brought from Africa in 1972 and was part of a group maintained at the Dvur Kralove Zoo in the Czech Republic.

She and another female rhino named Nola came to the Wild Animal Park in San Diego in 1989 as part of an effort to breed the species.

Northern white rhinos are considered critically endangered. Along with a pair of rhinos remaining at the Wild Animal Park, there are six at a zoo in the Czech Republic and as few as five believed to be roaming in the African wild.