Faster and Easier to Use than Audubon Birds
Sibley is much faster to get started than Audubon Birds if you know the genera and are presented with a new species - one tap and you can type part of the name, e.g. "hum", and see a list. Audubon Birds annoys you every time with a prompt to log on to some social media site, which is silly if you are in a wilderness area. For me this makes a big difference when I am scrambling to see a list of possibles before the bird flies away. The rest of the interface takes a few minutes to learn and then transitions quickly between range maps, illustrations, and descriptions while keeping them all as large as possible. This allows you to check field marks more easily in low light or very bright light. The photographs in Audubon Birds are useful to consult after you have a tentative idenfitication, but the paintings in Sibley are better when you are trying to integrate several partial views through a thicket into a mental list of field marks.
Get the Journal instead about
The Sibley eGuide, v1.8