So, what r your favs? I am about to head back out and try my hand at the beaver again. Got my but kicked for the one week I was able to get out last month. With the 72 hour check rule, I should be able to run 10 traps or so, even with as busy as I am.
You gotta look at the buds... Terminal buds will be different between species and completely different between different family's/genus's. The form of ash will be different than tulip too.
Aspen/popple will look a bit like birch I suppose, but only with the younger trees but to me the bark is more gray-ish. Another tell-tale sign this time of year is birch will sometimes have catkins leftover from last season. It's hard to tell you the differences through a computer screen.....
I'm a landscaper and have been doing it for many years, so I can say with certainty that ID gets easier with time and experience.