africa african brush-tailed porcupine animal asia asiatic brush-tailed porcupine barb beaver biological classification brazilian porcupine brown hairy dwarf porcupine cape porcupine capybara caviidae chinchillidae convergent evolution dasyproctidae echidna hedgehog himalayan porcupine hystricognathi hystricomorpha hystrix italy keratin long-tailed porcupine malayan porcupine mammal middle french monotreme needle new world new world porcupine north america north american porcupine octodontidae old world old world porcupine orange-spined hairy dwarf porcupine pallid hairy dwarf porcupine perspiration plywood rodent scientific american skin sodium chloride sodium nitrate south america sphiggurus stump-tailed porcupine sumatran porcupine sunda porcupine tuco-tuco university of wyoming urine wikimedia commons wiktionary