Rabbits who are given a balanced and healthy diet do not need salt licks or mineral blocks. All of the nutrients that they need are available in a healthy pellet mix for adult rabbits as well as the variety of fresh leafy greens they receive every day. There is usually no harm in providing a salt lick to rabbits. They are able to regulate how much they need and avoid overeating the salt or drink enough water to compensate. However there are some scenarios where providing a salt lick can be dangerous. On the other hand, if you are making change to your rabbits diet there are cases where it makes sense to consider giving your rabbit a salt lick so that they can correct for any nutrient deficiencies.
Choosing Salt and Mineral Blocks for Horses
Salt in the Bible - Wikipedia
The Great Outdoors Stack Exchange is a question and answer site for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment. It only takes a minute to sign up. There are a number of places where salt can easily be found at or near the surface. Notably Salt Lake Utah, but there are also other Salt lick places of note. You would have to distinguish the reason for them gathering probably by moving closer, thereby scaring them away, then investigating the reason. Not very effective, because they can gather for many other reasons water, other food, social.
Foraging Salt Inland
Mineral content is quite variable in tropical plants and soils, and mineral uptake is complicated by many different factors. Salt licks can provide the minerals that are often lacking, such as phosphorus, sodium, calcium and magnesium. It is possible, however, to make your own salt lick out of local ingredients. Different materials can be put into salt licks to provide the necessary nutrients.
Salt licks and salt wheels are commonly given to small pets like chinchillas. But do chinchillas need mineral supplementation? Or would it be bad for them? Does a chinchilla need a salt lick? Chinchillas get everything they need from their diet of hay and hay pellets.