Excellent for quick field reference
I found this app to be invaluable as a quick source for band sizescon a recent Costa Rica trip on which I was banding Neotropical migrants. Another reviewer’s criticisms are invalid, I think, because Pigeons/Rock Doves/Rock Pigeons/Columba livia are NOT bandable with U.S. bands and both Spotted Sandpiper and Mourning Dove ARE included in the app’s database. Plus this app is FREE!