After zoo death, only 4 northern white rhinos remain on Earth

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The four remaining animals are an elderly female at the San Diego Zoo and a male and two females at the Ol Pejeta Conservancy in Kenya.

The male — the last living male northern white rhino — is under 24/7 armed guard.

Northern white rhinos were hunted to this point of near extinction for years, for their horns.

The horns are used in traditional Asian medicine.

The last of the wild rhinos were killed in 2006 in Garamba National Park in the Democratic Republic of the Congo.