Beef fat is called tallow and pig fat is called lard. Poultry fat is too soft to be used by itself, but it may be used in a ratio of about 10% with tallow or lard. Bear fat may also be used but it must be melted (rendered) quickly after the bear has been killed because bear fat will quickly become rancid. You may also use the fat from farm animals such as sheep or goats, and a variety of wild animals, such as beaver, opossum, raccoon, and groundhog. If there is any lean meat still attached to the fat, cut it off and make sure you only use the fat to make grease.