Far more exciting, in my opinion, is The Warbler Guide app. It has the various song types at your fingertips, complete with the spectrogram (when interpreting recordings this is the feature I use most often). You can rotate their 3D birds to any angle, which is useful when you catch a glimpse of a bird from less than an ideal angle (haven’t had to use for ID myself as I either know the bird anyway or the bird is so generic there is no way any angle will help me—still, I like playing with it).

They have all the regular views as well (side, face, 45 degrees, underside, undertail). Under each bird there are tabs with Comparison Species, Overview, Photos, Age/Sexing, and Maps, as well as the glyphs that they use in the book for range, where it feeds, etc. They have managed to take all the best features of the book and brought it into the app.

This app, if I may keep raving, sets the standard for other bird apps to follow. I’m sure Sibley has taken note, and I imagine future bird apps will incorporate these features.

Incidentally, when I emailed the authors to ask for info (and tell them how much I liked their book) they told me they have plans for other books in the series (shorebirds, sparrows, maybe a full field guide at some point).

So, yes, this would be a great gift for people interested in birds. I use it on a professional basis, but it is accessible to most people interested in birds.