Unfortunately we couldn't watch that video about Heck cows yesterday. The cattle were developed through genetic maneuvering by the Germans in the 1920's and 30's with the thought of recreating ancient aurochs, wild bovine-like animals that were very aggressive and self-sufficient.
Since then farmers and zoos here and there have been housing these animals, which are fortunately not roaming wild all over Europe as was the original intention. A farmer in Devon, UK had to cull part of his herd recently when the animals proved so vicious that the farmer no longer felt safe in his own fields. 20 animals put down. Sad.