There is, sadly no scale in this image, but suffice it that a man a bit over six feet can easily stand beneath this tree which has a diameter of about 8 inches where the ‘trunk’ actually starts.
It might be better to ask what this is? This is a perfectly well formed black birch actually, much healthier than its compatriots of the same age growing around it. It has a nice full and balanced crown. It just started in a slightly unusual location. Namely at the top of a pine snag about eight feet tall.
This second picture shows its growth clearly. You can see through the old snag, which provides no structural support at all.
One can see where the legends of walking trees come from. Fancy meeting this in woods (once the snag falls out) on a moonlight night?