There’s a Peterson Field Guide to Backyard Birds app from Wildtonesthat’s compatible with the iPhone, the iPod Touch, and the iPad. There are over 180 birds – far more types than we get in our yard – so chances are excellent you’ll be able to identify the feathered creatures passing their time in your “habitat.”
It includes arrows to the key field marks.
There’s an illustrated index by family.
I think this is the way I’m finally going to get through that Peterson Field Guide sitting on my bookshelf. I’ll keep you posted. Let’s hear from you, too, about the birds you find with your copy of this splendid app.