I have applied 15 Scratch (nine months) to your account. I am pretty sure you have 3 more outstanding. I will do another GFM award list later this week.
Is there a legal definition for poultry, livestock, or backyard chickens as pets? I could use a legal definition of the difference. Our fancy, funny little birds were definitely not bred for production of anything more than laughs and oggles.
These definitions are outlined in each city's code. They vary from city to city, so I suggest you take advantage of the search function. Control F works well too
Look for poultry, fowl, livestock, domestic animals, agriculture. I would guess your understanding is correct.
The code enforcement officer allowed our chickens 2 years ago, based on the wording in the city code which never states chickens are not allowed, but it doesn't have any details about keeping chickens either. We have had his approval for that long, and he helped us get the right permits to build the shed we keep the chickens in. He did say, he was aware St. Charles has had a long history of backyard chickens, hence the wording "...unlawful to sell barter or give away any chick or fowl that has been dyed an unnatural color...", and many old coops can be seen in many old yards.
99.9% of the time, if the code does not specifically prohibit it, then chickens are allowed. There may be other item listed later in the code which regulate zoning, proximity, sanitation, and noise restrictions. ie- permits for your shed.