Why do animals lick the dark rocks in Old Yeller?

In "Old Yeller," animals lick the dark rocks because they are seeking salt, which is an essential nutrient for their survival. The heat of the sun causes the rocks to absorb warmth, making them more attractive to animals looking for minerals to supplement their diet. This behavior also highlights the natural instincts of wildlife in the novel, illustrating their need to fulfill basic survival needs in their environment.