Encourage more birds to come to your yard for a friendly visit with Perky-Pet’s Mason Jar Wild Bird Waterer. The crystal blue mason jar holds 32 ounces of water and resembles the vintage glass canning jars used in the 1800’s. And for your convenience, it’s easy to fill and clean—all you have to do is unscrew the mason jar from the shiny, steel base, fill it with water and screw back into place! Perky-Pet’s waterer is designed to attract a variety of wild birds like bluebirds, swallows and warblers.