Every Hollywood story needs a villain, and a conflict between ‘the bad guy’ and ‘the good guy’. Lutz Heck, who happens to be the former in The Zookeeper’s Wife, was however a much more ambiguous person. He was a high-ranking Nazi officer, and like many Nazis, was crazy about the idea of purity of the breed. Personally, he was obsessed with the idea of recreating (through genetic experiments) extinct species of ancient European cattle and horses (the tarpan). He was ready to do whatever it took to make his dream a reality, so the war gave him the opportunity to rob Eastern European zoos of every specimen he needed, and he helped himself.
On the other hand, he was a friend of the Żabiński family from the times before World War II and indeed they had some hopes of using this relationship as a possible lifesaver for the dying zoo. However, it did not work exactly as they had planned. Heck decided to take the species he wanted to the zoos in Berlin and Munich ‘for safekeeping,’ so they would be spared the horrors of war. Unfortunately, he later decided that the other animals should be wiped out. He even went as far as organising a hunting party in the zoo. On New Year’s Eve, a group of Nazi officers showed up at the zoo and gunned down a vast number of the animals which were left there.
Because the zoo was soon turned into a pig farm and later also into a complex of allotments, Heck was no longer in charge of it and he seems to have disappeared from the Żabińskis’ lives quite early on. He didn’t go after their Jewish guests, he didn’t even stay in Warsaw for very long (or until the Warsaw Uprising, as the movie suggests). Although the story of a German Nazi officer taking Ryś into the backyard and pretending to shoot him is true, it was not Heck who put on that cruel performance.