Actually I recently bought the Sibley bird guide for my iphone, paid 30 bucks for an app!! I love it. I like to travel light when I'm birdwatching, so one less heavy book to lug around is great. It has some features that a book can't have, such as comparing two similar birds side by side, and listening to bird calls. And it's very quick to keep my "day list" (birds I saw on this outing) in the same app. I can also export the list as a CSV file. I love having my bird list as a spreadsheet instead of notes in a journal.
Even before the Sibley iphone app, there were different versions of the book: a bigger, heavier one for home use, and two smaller, lighter ones for the field. I do still enjoy perusing the bigger one at home. But I am loving the Sibley iphone app and I won't bring a field guide with me anymore.
eP
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