Cindy Mead, the well-known naturalist photographer, has posted invaluable information and sources for people who maintain bird feeders on her blog, Woodsong. Thank you, Cindy!
For reference, Cindy lives in the Upper Peninsula in Michigan, but most of the information in her post is applicable pretty much anywhere. I'll be adapting it a bit for suburban southern Arizona. For example, I feel lucky if I see one squirrel or snake in a month anywhere near our garden.
Top of my birthday wishlist was birdfeeders (my first!) and desert-loving plants to attract birds and butterflies. Since I've had them (less than a month now), I've seen new birds and butterflies and have watched some wonderful interactions between birds. I've posted glimpses of these on my blog and will probably do a series of posts later in the year, when I'm more comfortable with it all.