They lost a city council vote last week, but advocates of backyard chickens in Medford aren’t giving up. Instead they’re turning to the airwaves, hoping the mayor or least one council member will reconsider their votes. “Citizens For Chickens” are pooling their money for an ad campaign on the local radio station. Joe Kohn, whose three chickens precipitated the council action, says he’s been given a month to get rid of his birds. His eight year-old son Zachary is heard on the commercial, urging chicken supporters to contact the mayor and council. The city council deadlocked 4-4 on August 17th, on a measure to prohibit keeping chickens in the city, and Mayor Mike Wellner voted in favor of the bird ban.