On our ranch in West Texas, fox (grey) are a piece of cake to call in. Whoever came up with the saying "sly as a fox" had obviously not been around too many. Sure they are smarter than chickens but, come on, so are brine shrimp.
A few weeks ago we called in 3 grey foxes in less than an hour. We didn't even pretend to hide. Heck, we didn't even get out of the truck. I just put the caller out and started working the magic.
Last year, my dad was looking for sheds and walked up on what he thought was a dead animal, only to discover it was sleeping fox!