Salt licks Porcupines in search of salt sometimes encroach on human habitats , eating plywood cured with sodium nitrate , certain paints , and tool handles , footwear , clothes and other items that have been coated in salty sweat .

Porcupines in search of salt sometimes live in human places , eating plywood cured with sodium nitrate , certain paints , and tool handles , footwear , clothes and other items that have been coated in salty sweat .
