Porcupine, Porcupines, Erethizon dorsatum, fauna, herbivore, herbivorous, herbivores, Mammal, Mammals, Rodent, Rodents, North American wildlife, wildlife, Forest, Forests, Woodland, Woodlands, North America, Rocky Mountains, Kitchin, Hurst, quill, quills, Porcupine Quills, defense, defence, defensive posture, dandelions, dandelion field, Spring, Vertical