They are endemic in both the Old World and the New World. Porcupines are the third largest of the rodents, behind the capybara and the beaver.
Weighing between , they are rounded, large and slow. Porcupines come in various shades of brown, grey, and the unusual white. Porcupines' spiny protection resembles that of the unrelated erinaceomorph hedgehogs and monotreme echidnas.
Old World porcupines (Hystricidae) have quills embedded in clusters, whereas in New World porcupines (Erethizontidae) single quills are interspersed with bristles, underfur, and hair.
Salt licks placed nearby can prevent porcupines from injuring themselves.
Source: Wikipedia > Porcupine
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