Old World porcupines are usually terrestrial and normally do not climb trees; need only shelter from the weather and for periodic nesting. They often use abandoned deep burrows of other animals; caves, rock crevices, decaying logs, hollow trees, and holes dug by other animals; or deep burrows that they have excavated themselves. Nests are constructed of plant material within the den. Burrows can be complex systems, where many may live in adjoining burrows and may be used for many years. A single burrow may hold up to 10 individuals.

A South African porcupine (Hystrix africaeaustralis) with young in the Kalahari Desert of South Africa. (Photo by Clem Haagner. Bruce Coleman, Inc. Reproduced by permission.)
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