The last male northern white rhino on Earth is too old to get it on but, luckily, not too old to pass it on.

Scientists hope to save the species by creating the first “test tube” rhinoceros using the sperm of Sudan, a 42-year-old bull rhino, and eggs taken from the two female rhinos he lives with in a wildlife park in northern Kenya, The Sunday Times of London reported.

A crowd-funding initiative is seeking to raise the $750,000 required for the rare rhino in-vitro fertilization project.

Due to his advanced age, the male bull is no longer able to mount and impregnate a female, but he can still donate sperm.

His samples have been collected, and the vials are being stored inside tanks of liquid nitrogen in a zoo in the Czech republic.

The fertilized eggs will be implanted into a female from the southern white rhino herd, who will serve as a surrogate mother.

“It’s a race against time,” Richard Vigne, who runs the Ol Pejeta wildlife residency, told The Sunday Times.

“If it takes too long, you might end with the last female northern white rhino dying,” said Vigne.

Only four northern white rhinos are left, making the species one of the rarest in the world. A third female rhino lives in the San Diego Zoo.

Even if the project is successful, northern white rhinos might still be doomed, says an expert.

“Once you get down to four or five animals, you can’t even call it a species anymore,” said Rob Brett, Africa program director at Fauna & Flora International. “For that, you need a minimum of 20 unrelated animals . . . It is unrealistic to say you can save the species,” he added.

Scientists do have a few other last-ditch plans to save the species.

One is to cross-breed the northern rhino with its close relative, the southern rhino. That would create a new hybrid animal with some traits from the northern rhino.

Another option is to clone the species.

“As humans, we have a duty to try because we are the ones who brought these animals to the point of extinction in the first place,” Vigne said.