The descriptions are rather lacking. The option for a Wikipedia description is nice, but of course only works if you have internet access (which you might not when traveling, which is also when you might need the app the most…). Then you might as well have a Xeno-canto link… Would be nice if you could swipe through images. And some illustrations might be nice. Would be nice with the possibility to see global distribution maps. The selection of species, notably vagrants, seems a little arbitrary… (could you include all the species mentioned in the field guide?) The display of similar species is based on visual characteristics, not on similarities of sound/songs. Comparison of species could have a much more user friendly interface. Could have had an option to loop the sounds, and to listen to the sounds while viewing the pictures. I really appreciate the ability to see species name in three languages simultaneously.