FREE on iPad etc. Audubon Birds

I have one called Merlin, it is put our by Cornell University and is free. I like it because it asks 5 questions like where are you, size of bird, color, what was it doing, where did you see it (soaring, feeding, etc.) When you search on the iPad you need to change the setting on the top right from iPad only to iPhone. It will work on both as they have the same operating system. As it is free there is nothing lost if you do not like it. I will look at the Audubon one too.