

Source: Wild Birds Guides: Ruby-throated Hummingbird by Robert Sargent available at Wild Birds Unlimited
Wow you're going to have some very well cared for birds! You've asked a lot of questions so I'll just go down the list.
For much more information go to the Michigan Bluebird Society website at: http://www.michiganbluebirds.org/nestbox-basics#nest
For more information on the benefits of bats and how we depend on them for pest control, seed dispersal and to pollinate commercial products including bananas, avocados, dates, figs, peaches, mangoes, cloves, cashews and carob go to the Bat Conservation International (BCI) website: http://ning.it/dpjiDm.
Actually five species of hummingbirds have been sighted in Michigan. The most common hummingbird at Michigan feeders and gardens from April until October is the Ruby-throated Hummingbird. Ruby-throated get their name from the male's ruby-red feathers on the throat. The Ruby-throated male also has a forked tail that is not found generally on any of the other species of hummingbirds in Michigan. Both male and female have emerald colored backs and the female's neck and breast is white.
To attract hummingbirds you can use a feeder filled with sugar water. I talked earlier about the best hummingbirds feeders HERE.
You can also enhance your garden. Just a few of the flowers that hummingbirds like are: