Natural sources of salt are very rare across much of the continent. This substance is necessary for life. The drive to obtain salt can be as intense as that to drink or feed. Ungulates are known to risk their lives to stand and lick it off the highways in northern climes. In the absence of ready salted highways, salt licks on deer feeders etc, how do larger critters keep supplied?
In the case of carnivores, blood has a higher salt concentration and supplementation may be uneccessary.
In the case of herbivores, the reliance is on the minute quantities contained in vegetation.... but it is typically very minute.
What happens to either, when they get a real craving for salt?
It would appear that at this time a blood lust (The origin of the term???) could come over carnivores and they may kill beyond the need for meat purely for the blood. In human hunting societies it has even been noted that sometimes a hunter will down the beast and go "straight for the jugular" as it were to drink his fill. This has become practically unheard of to "civilised" man who has isolated salt and knows what it is.
Herbivores have it difficult, there's only one relatively concentrated source that's freely available... and that is urine... which in the warm months will just soak right into the ground. Although thier sense of smell for urine is a part of their defence system, they will in the grip of a salt craving actively seek predator urine for it's high salt concentration. Yes, in winter they eat the yellow snow.
Maybe we could expect a little of both from an omnivore... or some switch hitting on occasion from the others.
So where am I going?
Well one of the points here I guess is to highlight the realities of life, to say "If Sasquatch exists he's kind and gentle and doesn't do nasty things like suck blood." would be as ridiculous as asserting that the Pope never takes a dump. It's one of the screwdrivers in the toolbox of life and one he may need to use. However, with the increase in people putting out salt licks for deer and cattle, salt being available on the roads in winter (roadside plants also being probably quite salty year round) it may be something that is less prevalent now in more populous areas among all carnivores and herbivores, that either bloodlust or urine seeking is necessary. BUT, in remote areas of the North and the South that sees no road salt, these behaviours again become more likely.
Secondly, this is to point out the possibilities as winter arrives, of using urine as an attractant.. a wide variety of creatures obviously associate urine smell with salt, and in winter know it may be obtainable in yellow popsicle, or snowcone varieties, at the source of that smell. This may not be effective in areas amply supplied by salt. In remote areas however, if winter camping and Bigfooting, it may be an idea to have all your party pee at a place distant enough from camp to "dare" anything to try and get it, but close enough to observe. Typically you might otherwise all pee "behind the bushes out of the way" ... (come to think of it, isn't that always where all the strange rustles are, and isn't it always on the potty trips that people get spooked and think they nearly ran into something
)To a creature that has seen a salt lick before, yes it looks like salt, but does it smell like salt? I would suggest putting salt licks in a prominent visible position if you want to try attracting anything that way....
Flash.
It is naturally occurring from somewhere in Utah 
