![]() ![]() He must have known that mongrels enjoy better immune systems and have more tricks up their genetic sleeves, while in a closely knit species, however "perfect," any illness that kills one animal threatens to wipe out all the others, which is why zoos keep careful studbooks of endangered animals such as cheetahs and forest bison and try to mate them advantageously. Still, it is surprising that Heck the zoologist chose to ignore the accepted theory of hybrid vigor: that interbreeding strengthens a bloodline. ![]() ![]() “The Lutz heck that emerges from his writings and actions drifted like a weather vane: charming when need be, cold-blooded when need be, tigerish or endearing, depending on his goal.
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