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  • rodent
  • The porcupine is a caviomorph rodent whose ancestors rafted across the Atlantic from Africa to Brazil over 30 million years ago, and then migrated to North America during the Great American Interchange after the Isthmus of Panama rose 3 million years ago. (wikipedia.org)
  • deep
  • Porcupines are forced to exert a lot of effort if they are in need of food and the snow is deep. (wordpress.com)
  • If the snow is deep, the winter ranges of Porcupines are considerably smaller (18 acres in one research study) than their summer ranges (160 acres in same study). (wordpress.com)
  • often
  • Porcupines fall out of trees fairly often because they are highly tempted by the tender buds and twigs at the ends of the branches. (wikipedia.org)