Mineral lick

A mineral lick is a place where animals can go to lick essential mineral nutrients from a deposit of salts and other minerals. Mineral licks can be naturally occurring or artificial. Natural licks are common, and they provide essential elements such as phosphorus and the biometals required for bone, muscle and other growth in herbivorous mammals such as deer, moose, elephants, hippos, rhinos, giraffes, zebras, wildebeests, tapirs, woodchucks, fox squirrels, mountain goats, porcupines, and frugivorous bats.

Such licks are especially important in ecosystems such as tropical rainforests and grasslands with poor general availability of nutrients.
Harsh weather exposes salty mineral deposits that draw animals from miles away for a taste of needed nutrients.
It is thought that certain fauna can detect calcium in salt licks.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0