In what ways has the pigs behavior come to resemble human behavior?

An easier question to answer might be in what ways have they NOT come to resemble human behaviors because there are so many ways they do.

Each of the commandments the pigs, I mean animals, created were to establish a distinguishing difference between themselves and humans. As we watch the pigs break these and change them subtly throughout the book, more and more human characteristics occur.

I think a very pointed thing to notice is the humans that the animals come to resemble, those magnified by the efforts of communism that Orwell intended to criticize. I also think it ironic that the animals chosen to mimic humans were pigs.

From the beginning, Squealer's manipulation through propaganda resembles the human effort to control other humans thoughts.

In Chapter 9, when Napoleon generates a new liter of pigs almost single-handedly, we see the natural effort of humans to create a superior race. Throughout history, as different leaders have risen to power, their 'kind' whether that be in race or religion or something else, tends to have privileges, just like the new liter of pigs were about to receive special treatments by the other animals, and education.