Why do the pigs start walking upright?

In
, the pigs start walking upright in the final chapter of the story and
there are a couple of possible explanations for this. Firstly, the pigs have devoted a lot of
time and effort to emulate humans. We have seen this earlier in the story when they, for
example, start sleeping in beds, wearing clothes, and drinking alcohol. Although they hated
their human masters, the pigs regard humans as the pinnacle of authority and power, so it is,
perhaps, not surprising that the pigs would want to emulate this ability, even if it is very
ironic.

Secondly, walking upright is symbolic of the pigs' elevated status
above the other animals. Like their better rations and ability to change the rules, walking
upright demonstrates that the pigs are not like the other animals on the farm. They represent a
different classthe ruling classand, by walking upright, this point is reinforced to
everyone.