A warning
Stay away from standing dead birch trees.
Birch bark is waterproof and the trees will rot to a soggy mush inside it. If you touch one of these rotten dead birch the bark can split and the whole thing collapses at once. You could be buried under a ton of rotten and soggy birch punk.
I know it's the wrong response, but the first thing I thought of after reading that was "If I ever go camping again, I'm taking my bow and a video camera, and look for dead birch trees!"