Scientists are close to bringing back a huge ancient cattle species called an auroch.
Aurochs roamed Europe for thousands of years until the last of their kind died in the Jaktorow Forest in Poland in 1627.
They were 7 ft (2.13 m) tall and weighed around 1,000kg.
Since 2009, European science teams have been breeding cattle which still carry auroch DNA. Two programmes are attempting to revive a version of the auroch through breeding.
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