Most interesting is the dedication of research throughout the life of the bird and the fact that it can possibly be a couple of decades! It's also interesting that the individuality of the birds can be learned.
Crows and Ravens are always gonna be tough to tell apart, but I certainly have a lot more to go by to check while taking this course. The snap ID is an absolute blast ! I'll go back to those again and again.
Of course, the ultimate learning is while we're outside watching these intelligent and interesting critters. I find crows and especially ravens to be absolutely remarkable and full of spirit. Nature has so much to offer, teach and bewilder us. And it just keeps giving!