Northern white rhinoceros

Researchers hope to use the eggs to create viable embryos that can transferred into surrogates since neither animal can carry a pregnancy to term.
Conservationists said this week that they'd successfully created embryos using sperm from long-dead northern white males.
His daughter Najin and granddaughter Fatu are now the last two remaining northern white rhinos on Earth.
Sudan, the world's last male northern white rhino, may not survive much longer, and there's talk of euthanasia.