Such an animal has not been seen on Czech territory for hundreds of years.

A Dutch breeding program has recreated massive bovines closely related to aurochs, once the heaviest European land mammal and the wild ancestor of today's cattle that became extinct in the 17th century.

A small herd was introduced to a Czech sanctuary Tuesday, joining some wild horses. By eating invasive vegetation, these animals will help to maintain the steppe character of the land.

After a nine-hour drive and few more minutes of hesitation, six calves — five cows and a bull — jumped out of a truck at dawn to take the first look at their new home at the former Milovice military base, 35 kilometers (22 miles) northeast of Prague.