First Nature's Bird Waterer and BirdBath features a durable water reservoir that holds over 100 ounces of water then releases it into four separate drinking pools on demand. The First Nature Bird Waterer and BirdBath can be mounted on a 4 x 4 post or can be hung with a chain and S Hook (chain not included). Simply remove the colorful royal blue water reservoir and fill it with fresh cool water. In between fillings both the reservoir and the drinking pools can be washed with warm, soapy water. As the birds bathe in or consume the water, it is instantly replenished from the reservoir. The signature of First Nature products is color and this Bird Waterer and BirdBath doesn't allow disappoint. The distinctive royal blue color adds a splash of color to any backyard. Bird Watering Tip: A good water source is one that is shallow (less than 3 inches) and one that is easily refreshed. Periodically clean your water source with a sponge or a brush and rinse before refilling. Clean fresh water is essential to attracting and providing for a healthy wild bird population. Perfect gift for outdoor lovers!