If something isn't explicitly mentioned in a bylaw, that does not make it legal by default. A lot of bylaws aren't detailed enough to list every single possible case scenario. So if poultry aren't explicitly banned from the woods, that doesn't mean it's legal to let them roam there. It just means that that area of law isn't defined, maybe because there hasn't been a need so far. But if you let them roam and people take note, they can raise the issue before the authorities and ask for the bylaw to be amended to specifically address poultry in the woods. And then you may get yourself an actual explicit ban. Towns are having to do a lot of clarifications and amendments to local bylaws with regards to chickens, now that they are becoming so popular and towns are finding themselves lacking specific, explicit regulations. So people exploit the void and assume anything is legal by default if not specifically banned, and they overstep all kinds of good will and tolerance their neighbors may give them, because "it's not illegal". And you end up with battles and animosity, and some towns responding by putting in place explicit bans that are much harsher than necessary, because they don't want to deal with neighbor disputes. So the entitled people who overstep what is reasonable and respectful of their surroundings, end up ruining poultry-keeping for the whole town by bringing on restrictions and bans.