I haven't noticed any posts yet about the animal holding capacities of our new home streets and back yards. I've been experimenting on my home street and currently have 20 each of piggies, chickens and butterflies on my home street. The really interesting thing is that when I added my 19th and 20th chicken and butterfly, in each case several of them immediately complained about crowding but after a short while the complaining stopped and everyone was happy. I haven't yet had any complaining from the piggies. So currently it's 20-20-20 and everyone is happy. Oh, and my home street is expanded to maximum size.
On another point, I haven't had any butterflies move on to a better place from my home street, and I do have milkers running at high capacity. In my old home, with milkers, I found butterfly life was about 10 days. Has the mechanic been changed?