Original: Natural sources of salt consumed by porcupines include varieties of salt-rich plants (such as yellow water lily and aquatic liverwort), fresh animal bones, outer tree bark, mud in salt-rich soils, and objects imbued with urine.
Simplified: Natural sources of salt used by porcupines include different salt-rich plants (such as yellow water lily and aquatic liverwort), fresh animal bones, outer tree bark and mud in salt-rich soils.