WIDE MOUTH BIRD 10 OZ. This enclosed water supply protects your birds water from bacterial contamination, seed hulls, feathers and other droppings. The water will taste better, stay fresher and cleaner and reduce stagnation. The Wide Mouth TM,. 45 degree bottle cap makes this bottle easy to fill and easy to clean. A quick release Bottle Holder for ease of operation in and out of the cage completes the package.