I agree that I've seen hens, eggs and animals on CL, but, from the TOS:
Partial list of items for sale and services the advertisement of which is not permitted on craigslist:
* Obscene material or child pornography.
* Offer or solicitation of illegal prostitution.
* Weapons and related items, including but not limited to firearms, disguised, undetectable or switchblade knives, martial arts weapons, scopes, silencers, ammunition, ammunition magazines, BB guns, tear gas or stun guns.
* Items issued to United States Armed Forces that have not been disposed of in accordance with Department of Defense demilitarization policies.
* Fireworks, including but not limited to "safe and sane" fireworks or any destructive devices or explosives.
* Controlled substances or illegal drugs, substances and items used to manufacture controlled substances and drug paraphernalia.
* Alcohol or tobacco products.
* Prescription drugs and medical devices, including but not limited to prescription or contact lenses, defibrillators, hypodermic needles or hearing aids.
* Nonprescription drugs that make false or misleading treatment claims or treatment claims that require FDA approval.
* Blood, bodily fluids or body parts.
* Household pets of any kind including but not limited to dogs, cats, primates, cage birds, rodents, reptiles, amphibians, fish. Re-homing with small adoption fee OK
* Pet animal parts, blood, or fluids - including but not limited to stud/breeding service
It does say HOUSEHOLD pets, not livestock or poultry, and someone is likely interpreting that a bit too rigidly.
It also says that it's prohibited to sell used clothing unless it's been sanitized, and you KNOW that no one follows that.