Great supplement
I use this app as a supplement to my Sibley app. For bird I.d., I like the field marks, and accurate illustrations of the Sibley. However, I really enjoy all the extra info included in this app. It contains real pictures, more sounds, and reliable ecological information. I also like that it contains birds of Hawaii. Huge bonus for my recent vacation. I tried having one guide on my phone, but it was inadequate. I use both this app and Sibley equally for their strengths. If youre a serious birder, I recommend it.
Ian Ibis about
iBird Pro Guide to Birds, v9.21