I live in Wilbraham as well, and have been told the "5 acres" rule. The by-laws are confusing and do not explicitly state that chickens are considered livestock or for agriculture. It is very disappointing and I intend to have chickens anyway. I know others who have chickens and have not had any issues.
Anyone know the chicken laws for Wilbraham, Ma ? - Page 2
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We just had to rehome a rooster as well, so I understand your frustration. I am glad to know that you were able to place him at the farm that is close to you, though.
Good luck to you!
Our neighbor has gone through the same thing. By laws in town need to be changed to allow people to provide for themselves the way they want to. A garden, chickens, etc should be allowed within reason. They will not give out a kennel license, though the state requires it. Some put their properties in 61A so they get a reduction in taxes, though they do not use it for agriculture.