The Anna Karenina principle states that there are lots of
different ways that an animal can be no good for domestication. It comes from a line
that says happy families are all alike but miserable ones are all miserable in their own
ways.
The reason that this is important is that it explains
why people in some places were not able to domesticate any large animals. Diamond
points out that there are many reasons why animals might not be good to domesticate.
For example, they might take too long to grow big enough to use. Or they might be too
vicious to tame. Other problems might occur as
well.
Because there are so many different ways that an
animal can be unsuitable for domestication, most of them are unsuitable. This means
that places like Africa can have lots of animals, but none might be suitable to
domesticate. This (rather than any theories about the characteristics of the people in
those areas) explains why no animals were domesticated there.
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