Though this is becoming less common in zoos, it's still fairly normal to see peafowl, guinea fowl, and domestic breeds such as chickens and turkeys as free-roaming animals that just wander about the zoo. In Planet Zoo this is difficult to accomplish because in order for the game to not consider an animal 'escaped' the animal needs to be confined within a barrier.
However, I have been thinking about a potential solution. I wonder if it's possible for the developers to simply make it so certain animals (currently the peafowl, in future maybe others) see the null barrier as a physical force. That is to say, you still build a habitat using the null barrier, but unlike other animals the peafowl can't walk through it. That way, the game doesn't think the animal has escaped, and you can create the illusion of free-roaming animals with an invisible habitat that guests can pass right on through.
However, I have been thinking about a potential solution. I wonder if it's possible for the developers to simply make it so certain animals (currently the peafowl, in future maybe others) see the null barrier as a physical force. That is to say, you still build a habitat using the null barrier, but unlike other animals the peafowl can't walk through it. That way, the game doesn't think the animal has escaped, and you can create the illusion of free-roaming animals with an invisible habitat that guests can pass right on through.