For thousands of years the aurochs were the largest land mammals in Europe, until the rise of human civilization decimated their numbers, and the last of the species died in Poland in 1627 -- one of the first recorded cases of extinction. Founder and ecologist Ronald Goderie told CNN: "We thought we needed a grazer that is fully self-sufficient in case of big predators...and could do the job of grazing big wild areas. "We reasoned that this animal would have to resemble an auroch." In conjunction with the Rewilding Europe group, the Tauros, bred from a number of current species with auroch ancestry, have been released into areas of Spain, Portugal, Croatia, the Czech Republic and Romania, where they have had to contend with wolves and other predators. "We see progress not only in looks and behavior but also in de-domestication of the animals," he says.
– Standing nearly as tall as an elephant, the aurochs grazed for 250,000 years until its extinction in 1627. But its story may not end there: Scientists say they are close to resurrecting the "supercow," once the largest land mammal in Europe, reports CNN. In search of herbivores to maintain land areas at risk of becoming barren, geneticists began breeding aurochs descendants with similar cattle breeds in 2008 and found they could "produce animals far closer to the aurochs than we would have expected," says Ronald Goderie of the Tauros Project. Fourth-generation beasts have now been introduced in Croatia, Spain, Portugal, the Czech Republic, and Romania, with promising results. "We see progress not only in looks and behavior but also in de-domestication of the animals," says Goderie, noting one herd has learned to defend itself against wolves. The hope is that they will become part of the ecosystem to maintain land for other animals. But a rep for the International Union for the Conservation of Nature says it's unclear "whether primarily wetland forests like the aurochs used to inhabit still exist, whether it could negatively impact wild or domestic plants or animals, and if it might endanger people." Indeed, a British farmer had to kill some of his aurochs-descended cattle in 2015 because they tried to kill him, per the Independent. That species, however, came from a Nazi breeding program that used Spanish fighting cattle. (Tinder could save giant pandas from extinction.)