EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

For 35 years, American zoologist Laurie Marker has been collecting and storing specimens in a cheetah sperm bank in Namibia, hoping conservationists never have to use them. Rwanda's biggest national ...

Add Yahoo as a preferred source to see more of our stories on Google. Preserving the northern white rhino now requires overcoming functional extinction, as there are only two females remaining. The ...

Scientists fight to revive the northern white rhino — before it’s too late. The northern white rhino teeters on the brink of extinction. At Ol Pejeta Conservancy and the San Diego Zoo’s Frozen Zoo, ...

In a groundbreaking effort to save the Northern White Rhino from the brink of extinction, scientists have embarked on an ambitious mission-implanting lab-created embryos into surrogate rhinos in hopes ...

Researchers at Kenya’s Ol Pejeta Conservancy witnessed a biological breakthrough recently when a southern white rhinoceros ...

Sudan who lived at the Ol Pejeta Conservancy in Kenya was put to sleep on Monday after age-related injuries worsened significantly. Sudan, 45, who lived at the Ol Pejeta Conservancy in Kenya was put ...

SAN DIEGO, Calif. (KABC) -- Nola, an endangered female white rhinoceros, died Sunday at the San Diego Zoo Safari Park. The San Diego Zoo Global Wildlife Conservancy tweeted out the sad news around 11 ...

One of the last living northern white rhinos is recovering from a surgical procedure that her keepers hope will cure a chronic infection threatening the animal’s health. Nola is a 41-year-old ...

Add Yahoo as a preferred source to see more of our stories on Google. EDITOR’S NOTE: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, ...

An Instagram post about the last two northern white rhinos references a scenario conservationists have warned us about for decades. Saving this species may now be an impossibility. The only living ...