If you have an Android smart phone or an iPhone, iPad or iPod you can get one of the best bargains in the tech world -- "Audubon Birds: A Field Guide to North American Birds" is on sale for $2.99.
I think I paid $19.99 when I downloaded this app for my iPad about a year ago, and it was a bargain then. You can look up more than 700 species by their shape, family or name and use an advanced search function to add information, including geographic region, color, size and wing shape.
The pictures are fantastic, usually several for each species to help nail down differences among males and females and juveniles, and between summer and winter plumage. There are details about the birds' summer and winter ranges and migration routes, and you can even listen to their songs and calls.
I don't know how long the sale price will last, so if you're even a casual birder, I'd check the Apple app store or Amazon right away.
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