Designing and drafting a plan for your avian friends is also very important Keep in mind that the bird's safety is your utmost concern so make sure that they will be protected from the predators. It is also best to use slanted roofs so that the dirt, moisture and rain would not gather on top that may eventually cause rotting of wood. What you need to do is to provide proper ventilation in your bird deck house. If you have one that is fully covered, consider putting on holes on the top, bottom and the sides. You do not need to do this if the bird deck house has an open space where birds can move out and about. If you have a pet bird that you do not want to fly away from you, consider having bird houses that lets the air in naturally. Determining the right height is important in preventing the invasion of sparrows. It can be noted that blue birds fly away at the first sign of the approaching predators. This is the reason why the right height is crucial if you want to make the blue birds come back to the bird house that you built for them. There must be a piece of wood that has to be placed therein to allow the birds to perch or sit. You could choose from either the kin dried hardwood, cedar, or ply-board. The exterior design. Non-toxic paints and weather-resistant furnishing need to be employed in the birdhouse. The nesting cavities. There has to be a separate place for nesting to keep the birdlings protected. Some people choose to build hummingbird houses on tree trunks where they can be as close to the trunk of a tree as possible. 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. Now, one of the good things about a decorative bird house is that these are usually made based on the natural environment of birds. Thus, a bird house looks entirely different from a bird cage. It's like you're tricking your pet bird that they haven't been taken away from where they live. There are also many styles of bird houses that are made with modern styles and some are older or classics like Victorian styles and etc.