Urban Nature Pictures day 8
Jan. 8th, 2010 07:57 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
urbpan
Oak burl with dusting of snow and acorn mast.
A burl is a rounded outgrowth of a mature tree, often a response to an injury. Acorn mast is the meat of the nut, left behind when the nut is opened (in this case by squirrels), and can serve as a winter food source for various kinds of wildlife.
