Free livestock can be obtained from multiple sources, including online classifieds such as Craigslist, through local groups on social networking sites such as Facebook, or by checking bulletin board postings at a local farm supply store. Word-of-mouth is often helpful as well.
People who raise livestock animals as pets or on hobby farms often tire of them and offer them for free on classified sites such as Craigslist. Search Facebook for local classified groups. Often, these groups advertise local garage sales, community events and animals in need of homes. A "livestock wanted" ad posted in these places can yield good results. It's not uncommon to find rabbits, chickens and ducks offered after Easter, and even large animals such as horses are sometimes discarded as feed prices increase.
Check with local farmers and livestock auction houses, as they are often the first places people try to take their unwanted livestock. Local 4H program leaders may also be able to help find a source for free livestock animals. Large animal veterinary offices may also have bulletin boards available to help their clients place unwanted livestock animals. Because free livestock animals may have health problems, evaluate the animals for disease before adding them to your farm.