Anna Karenina principles

Premise : In the book "Anna Karenina" it is stated that 'Happy families are all alike;every unhappy family is unhappy in its own way.

J. Diamond uses this analogy to suggest why some species were domesticated and others not.

1. Elephants were seemingly rejected because of the gestation period. It becomes difficult to ramp up breeding such a species.

2. Zebras are not easy to be roped or tamed, along with their nasty attacking habits. Thus though they are close to donkeys and horses, they aren't domesticated.

3. Gazzele and antelopes due to their panicking nature and irregular social structure.