Conservationists are dealing with some very sad news this Monday. The San Diego Zoo, one of America's largest zoological parks, has announced the death of Angalifu, a male northern white rhinoceros (Ceratotherium simum cottoni).
The male, age 40 (born in 1974), was a favorite with visitors of the zoo's Safari Park. The death leaves just one known surviving male of the subspecies. And there's only four females left, as well.