There are millions of Black Walnuts, which are an excellent food source, that go to waste yearly in North America, since people do not know how to process or crack the nuts, due to the strength of the hull and the nut proper. . First it is necessary to remove the hull, then crack the nut to get the meat. Here is my simple method utilized to process this wonderful nut. The pictures are annotated and are self explanatory.
http://www.durgan.org/URL/?UFWOW 17 October 2008 (Juglans nigra L. – black walnut) or American Walnut.
http://www.durgan.org/URL/?IWMKD 19 October 2008 Black Walnut Nutcracker.
http://www.durgan.org/URL/?Squirrel 25 June 2009 Black Walnut and Squirrels.
Black Walnut nuts are extremely tough and the meat is in the four quadrants around the shell. These nuts are very difficult to crack even for humans. I observed that the squirrels simply gnaw the four corners and remove the meat.