The Perky-Pet Mason Jar Wild Bird Waterer offers fresh, clean water to attract a larger variety of birds while adding a rustic look to any bird lovers yard. The blue color of this bottle is reminiscent of vintage blue glass canning jars used in the 1800's. The waterer is a simple to fill and clean, just unscrew the bottle from the base, fill with water and screw the base back into place - it's that easy. If you want to attract more birds to your yard then the Perky-Pet Wild Bird Waterer is for you.