(CNN) - Two female northern white rhinos are the only animals left to save their subspecies from extinction.
The females are the offspring of "Sudan", a prized male rhino that was euthanized after battling illness and old age.
Scientists say that the need to preserve the northern white rhino is dire.
There are no known animals left in the wild.
In a race against time, international experts are resorting to science to try to sustain the subspecies.
A committee at the conservancy is also looking at various alternative reproduction techniques, including in-vitro fertilization.
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