On Tuesday, the team behind the plan to bring mammoth-like animals back to the tundra announced the creation of what it is calling wooly mice, which have long fur reminiscent of the woolly mammoth.

A pair of dogs and a cat saunter throughout the property. But they are outnumbered by the pigs. The pasture-rich farm is perfect for slow-growing Mangalica pigs, who are known by their shaggy hair. He ...