A little ahead of Christmas this year we had a chunk fall out of the fir tree next to our back door.
Given that we live on a hill in the open prairie this sort of thing happens. A couple of years after we moved in an old Maple situated between the house and the barn fell, and I am forever cleaning up limbs from windfall.
This tree stands directly outside my home office. It's been a persistent piece of the scenery from that room since I was a child, sneaking into that room against my grandmother's wishes, playing with my uncle's train set and wondering over all of the other "ancient" toys. It's a regular friend when I gaze out the window when I'm working.
It looks to me - based entirely on my complete lack of expertise on trees - like the original hunk that came out is part of a larger splintering along the trunk, and that this is the next piece to come down. More is still hanging in the tree and will probably need to be cut out if the tree is to be kept from simply splitting in half.
Given that complete lack of expertise, my thoughts probably shouldn't be the last call on that one...