Aspen or Birch?

There are lots of things to love about Anchorage and one of my personal favorites is the TREES! We live in an older house, which means we have bigger trees in our backyard. But are they birch trees or aspens?? The main difference between the species is the shape of the leaves, but we've had naked trees since we moved in... I'm going to go with Birch trees after reading this article. The article says moose like birch trees and there was definitely a moose chowing down on one of our front yard trees. What's your vote?