But this is not saying that you cannot have them in any other places. There are hummingbird houses that are built on shrubs, poles, house gutters and overhangs. The location where it should be built should be high enough so that pets and pests will not easily reach them. If ever they did, you will lose the bird that your treasure plus all the pleasures that come with it. The birds place a high regard for their territories especially if there are nests inside. Watch out for the materials that you use. The best material to be employed is the wood. If possible, do not use the lumber as it tends to poison the birds once it gets wet. The paint could be used on the exterior and not inside. Like us, these so called "cavity-dwellers" also have specifications in relation to the kind of the type of habitat they want. There are just minor feature issues or measurements for the birds, but they are very essential in their living. Generally, there are some guidelines ton be followed in building bird houses. This is one of the reasons why most fancy bird house owners plan meticulously how the bird house is designed. They consider some important aspects like the color, style and how best it will suit the surrounding area. Fancy bird houses can add a nice touch to an ornamental plant of garden that you have in your home. Many of the bluebirds have consequently learned to adapt to these man-made bluebird birdhouses and it could be assessed that they have already found the place homey compared to the holes created by the woodpeckers. There are also bluebird trails that could be found along the golf courses and wildlife. Among the primary purpose of bird houses is to protect a bird from their natural predators such as cats and snakes. Birds' nests may also have these pests that destroy the eggs before they hatch. Now, most bird houses are equipped with devices that can avoid these pests from ever coming to your birds' nest.