There are 66 x 2 = <<66*2=132>>132 chickens
There are 66 + 132 = <<66+132=198>>198 goats and chickens
There are are 198/2 = <<198/2=99>>99 ducks
There are 99/3 = <<99/3=33>>33 pigs
There are 66 - 33 = <<66-33=33>>33 more goats than pigs
#### 33