Franklin Park Zoo, Stoneham Zoo

So rarely in life do you get something for nothing. Today, for no charge at all, you can get zebras, chickens, monkeys, lions, and birds. That's right, as part of an annual tradition, both the Franklin Park Zoo and the Stoneham Zoo let you in for free today. You can find out what animals are on view on the zoos' websites. 10 a.m.-4 p.m. Stone Zoo, 149 Pond St., Stoneham. 781-438-5100. stonezoo.org. Franklin Park Zoo, Franklin Park Rd., Boston. 617-541-5466. franklinparkzoo.org