You know Spring is in the air when you spot your first cardinal, and there is nothing more interesting for bird watchers then a family of birds moving in to liven up the yard. Just watching the birds as they build and tend to their nest, and caring for their babies. 

Ever tried to make a birdhouse?

You have to really know what you're doing with the construction and design, all the way down to the proper size of the opening.
There are many "How To" websites and we found one that even lists Birdhouse Dimensions for Individual Species.

Check out this site at: http://www.cornerhardware.com/howto/ht071.html