Ultimate Renewable bamboo feeders and houses are made with eco-friendly bamboo. Bamboo is fast-growing, durable, and naturally insect, squirrel, and weather resistant, making it not only the perfect choice for quality products, but environmentally friendly and an ultimate renewable resource. This bluebird house has a specifically designed entrance hole to discourage other unwanted species from invading the nesting area. Featuring an easy open side panel for seasonal cleaning. Fully assembled and ready to mount. Mount nest box approximately 4 feet to 5 feet high on a pole, baffled wood post or tree.