A northern white rhino, one of only six left in the world, died on Dec. 14 at the San Diego Zoo Safari Park in California. The 44-year-old male rhino, named Angalifu, succumbed to old age, according to park officials.
"Angalifu's death is a tremendous loss to all of us, not only because he was well beloved here at the park but also because his death brings this wonderful species one step closer to extinction," safari park curator Randy Rieches said in a statement.
The remaining five northern white rhinos worldwide all live in captivity, and with only one male in the species left, any future chance of reproduction will likely involve artificial insemination.
(Photo: San Diego Zoo Safari Park/Twitter)