Mary McDonald / North American porcupine {Erethizon dorsatum} climbing, USA

Michael Pitts / Common short tailed porcupine {Hystrix brachyura} foraging in litter, Flores, Indonesia

Michael Pitts / Common short tailed porcupine {Hystrix brachyura} foraging in litter, Flores, Indonesia

Jabruson / Confiscated tusks of African Forest elephants damaged by Crested porcupine {Hystrix cristata} Odzala NP, Congo Rep

Michael Pitts / Common short tailed porcupine {Hystrix brachyura} foraging in litter, Flores, Indonesia

Michael Pitts / Common short tailed porcupine {Hystrix brachyura} at water's edge, Flores, Indonesia

LYNN M. STONE / North American porcupine {Erethizon dorsatum} with deer's antler, Montana, USA

Larry Michael / Porcupine Mountains Wilderness State Park in autumn, Michigan, USA

Larry Michael / Porcupine Mountains Wilderness State Park in autumn, Michigan, USA

Michael Pitts / Common short tailed porcupine at waters edge {Hystrix brachyura} Flores, Indonesia

Thomas Lazar / North american porcupine {Erethizon dorsatum} sitting on post, Kettle River, Minnestota, USA

LYNN M. STONE / North american porcupine {Erethizon dorsatum} amongst birch leaves and antler, Captive, USA

LYNN M. STONE / North american porcupine {Erethizon dorsatum} amongst birch leaves and antler, Captive, USA

LYNN M. STONE / North american porcupine {Erethizon dorsatum} climbing tree in snow, Captive, USA

Pete Oxford / Young male Lion {Panthera leo} feeding on Porcupine, Okavango Delta, Botswana

LYNN M. STONE / North American porcupine (Erethizon dorsatum) USA

Larry Michael / Underside of North american porcupine showing teeth {Erethizon dorsatum} captive, Illinois, USA

Larry Michael / Leaf litter forest floor detail, Porcupine Wilderness Area, Michigan, USA

Larry Michael / Escarpment in Porcupine Wilderness Area, Michigan, USA

GEORGETTE DOUWMA / Black-spotted porcupinefish {Arothron hystrix} Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Black-spotted porcupinefish {Arothron hystrix} Lembeh Strait, North Sulawesi, Indonesia.

Karl Ammann / Hunter with brush-tailed porcupine, North Gabon, Central Africa.

Doug Perrine / Diver with inflated Porcupine fish {Diodon hystrix} Florida, USA.

Luiz Claudio Marigo / Prehensile tailed porcupine / Coendu {Coendou prehensilis} Gran Chaco NP, Bolivia

Luiz Claudio Marigo / Crested porcupine {Hystrix sp} Bolivia

Luiz Claudio Marigo / Prehensile tailed porcupine / Coendu {Coendou prehensilis} Gran Chaco NP, Bolivia

Luiz Claudio Marigo / Prehensile tailed porcupine / Coendu {Coendou prehensilis} Gran Chaco NP, Bolivia

Luiz Claudio Marigo / Prehensile tailed porcupine / Coendu {Coendou prehensilis} Gran Chaco NP, Bolivia

Michael Pitts / Common short tailed porcupine at waters edge {Hystrix brachyura} Flores Indonesia

John Cancalosi / Chocolate labrador retriever after encounter with Porcupine, USA.

Mark Moffett / Thin-spined Porcupine (Chaetomys subspinosus) once thought to be extinct, on a tree trunk at night held by its tail by expert tracker Mr Souza and researcher Rivelino Galvao, both looking at the noctu...

Niall Benvie / Young North american porcupine climbing tree {Erethizon dorsatum}

Mark Moffett / Thin-spined Porcupine (Chaetomys subspinosus) nocturnal animal once thought to be extinct, Atlantic Forest, Espirito Santo, Brazil

Mark Moffett / Thin-spined Porcupine (Chaetomys subspinosus) nocturnal animal once thought to be extinct, Atlantic Forest, Espirito Santo, Brazil

Konrad Wothe / Common Porcupine (Erethizon dorsatum) portrait in tree, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) detail of quills, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) baby, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) baby climbing in tree, North America

Konrad Wothe / Common Porcupine (Erethizon dorsatum) mother and baby in tree, North America

Sumio Harada / Common Porcupine (Erethizon dorsatum) sitting on rocks, Rocky Mountains, North America

Sumio Harada / Common Porcupine (Erethizon dorsatum) climbing on pine trunk, Rocky Mountains, North America

Sumio Harada / Common Porcupine (Erethizon dorsatum) sitting next to pines with mouth open, Rocky Mountains, North America

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) young female with porcupine quills stuck in lip, Denali National Park and Preserve, Alaska

Mark Moffett / Thin-spined Porcupine (Chaetomys subspinosus) nocturnal animal once thought to be extinct, Atlantic Forest, Espirito Santo, Brazil

Michael & Patricia Fogden / Prehensile-tailed Porcupine (Coendou mexicanum) in the rainforest, Costa Rica

Birgitte Wilms / Porcupinefish (Diodon sp), Red Sea, Egypt

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd, mother consuming afterbirth with newborn calf nearby, Arctic National Wildlife, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd, mother helping newborn calf stand, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd, mother with newborn calf, Arctic National Wildlife Refuge, Alaska

Norbert Wu / Porcupinefish (Diodon sp) swells up in defense, Philippines

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd migrating across tundra, North Slope, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) members of the Porcupine Herd during migration, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) members of the Porcupine Herd during migration, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd at calving ground on coastal plain, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd at calving grounds on coastal plain, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd at calving ground on coastal plain, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd crossing shallow stream, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) female and calf of the Porcupine Herd, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd on tundra calving grounds, Arctic National Wildlife Refuge, Alaska

Michael Quinton / Common Porcupine (Erethizon dorsatum) feeding on Pussywillow (Salix discolor) in the spring, Alaska

Michael Quinton / Common Porcupine (Erethizon dorsatum) feeding on Mistletoe (Phoradendron serotinum) in winter, Island Park, Idaho

Norbert Wu / Paraguay Hairy Dwarf Porcupine (Sphiggurus spinosus) arboreal unlike old world porcupines, tropical rainforest habitat, Costa Rica

Fred Bavendam / Porcupinefish (Diodon nicthemerus) swallows water to puff itself up and points its spines outward as a defense against predators, South Australia

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd on tundra ice patch to avoid Mosquitoes, Arctic National Wildlife Refuge, Alaska

Patricio Robles Gil / North american porcupine in tree {Erethizion dorsatum} Chihuahua, Mexico

Richard Du Toit / Damage to tree caused by Porcupine {Hystrix sp} Chobe NP, Botswana

Gertrud & Helmut Denzau / White tailed / Indian porcupine at night by water {Hystrix indica} India

LYNN M. STONE / North American porcupine in tree. (Erethizon dorsatum) Montana, captive US

GEORGETTE DOUWMA / Porcupinefish {Diodon hystrix} Andaman sea, Thailand

Pete Oxford / Lion {Panthera leo} male with porcupine quill in muzzle, Okavango Delta, Botswana

Peter Blackwell / Crested porcupine {Hystrix cristata} Central Kenya

LYNN M. STONE / North American porcupine, Autumn Rocky Mountains USA

Jabruson / Porcupine fish {Diodon hystrix} made into tourist curio for sale on Sal Is, Cape Verde Islands

Tony Heald / Porcupine walking {Hystrix africaeaustralis} Damaraland, Namibia

Tony Heald / Porcupine portrait {Hystrix africaeaustralis} Damaraland, Namibia

Tony Heald / Porcupine at water {Hystrix africaeaustralis} Damaraland, Namibia

Tony Heald / Porcupine drinking {Hystrix africaeaustralis} Damaraland, Namibia

Peter Blackwell / Crested porcupine {Hystrix cristata} foraging on ground, Central Kenya, Africa

Jeff Rotman / Porcupine fish close-up of spines {Diodon hystrix} Red Sea

Sumio Harada / Common Porcupine (Erethizon dorsatum) walking on path, Glacier National Park, Montana

Paul D Stewart / Woodcut illustration of Crested Porcupine (Hystrix cristata) with colouring. From Gesner's 'Icones Animalium' publ. Christof Froschover, Zurich, 1560. Of Gesner's many woodcuts this is one of the more...

Matthias Breiter / Common Porcupine (Erethizon dorsatum) feeding on leaves, Haines, Alaska

Rod Williams / African crested porcupine {Hystrix cristata} juvenile, captive, from Africa

Peter Blackwell / Two Crested porcupines {Hystrix cristata} foraging on ground, Kenya

Dan Burton / Close up of spines of Crested porcupine {Hystrix cristata}

Michio Hoshino / Caribou (Rangifer tarandus) of the Porcupine Herd, aerial view of migration, Arctic National Wildlife Refuge, Alaska

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating across tundra to calving grounds, Arctic National Wildlife Refuge, Alaska

Mark Moffett / Asiatic Brush-tailed Porcupine (Atherurus macrourus) atop cage about to be released back into the wild by rangers, Tam Dao National Park, Vietnam

Michio Hoshino / Caribou (Rangifer tarandus) aerial view of Porcupine Herd migrating, Arctic National Wildlife Refuge, Alaska