Majority Grey Fox Gland lure with partial Red fox added.  Extremly effective on grey fox, reds and coyotes.  Often fox gland is more effective on young coyotes than coyote gland lures.  Reigns supreme during summer and early fall trapping on calling in coyotes protecting pups, or the young pups themselves.  
 
Used at the majority of our flat sets any time we are in grey fox country.