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      You are here: Home / Nature / Porcupines as Sculptors

      Porcupines as Sculptors

      April 14, 2017 By John Davis Leave a Comment

      Porcupine by Larry Master (masterimages.org)
      Porcupine by Larry Master (masterimages.org)

      I see more Porcupines in the average month around my home in the Adirondacks than I saw in a year and a half of trekking the Eastern and Western Wildways, though on those long conservation journeys I hiked through thousands of miles of forest that looked plenty inviting for bark-eaters.  My fellow rambler Jerry Jenkins, author of the Northern Forest Atlas Project, has half-seriously proposed that here in the Adirondacks, at least, Porcupines — not quite the largest, but surely the pointiest of North American rodents — may be a keystone species.

      What is a Keystone Species?

      Porcupine by Larry Master (masterimages.org)
      Porcupine by Larry Master (masterimages.org)

      Keystone species are those that play roles in their ecosystems greater than their modest numbers would suggest.  Examples are Beavers here in forested areas and prairie dogs in western grasslands, both of which enhance natural habitats through their building and feeding habits; and Wolves and Cougars, which serve as regulators on herbivore behavior and abundance.

      North American Porcupines (Erethizon dorsatum; relatives of several similar quilled species of South America and Africa) may indeed play major herbivory roles here in the Adirondacks, where our forests grow much hemlock and hardwood.  Porcupines feed heavily on hemlock branches and deciduous tree bark.  Almost like climbing Beavers, Porcupines sometimes eat so much of a hardwood tree’s bark that they effectively girdle and eventually kill the tree.  An individual Porcupine may have a favorite hemlock that she climbs most days for weeks, eventually pruning it into a new, more compact shape.  Dead trees, of course, provide food and become homes for woodpeckers and cavity nesters, from chickadees to Fishers — the main predator of Porcupines.

      High Numbers of Porcupines in the Adirondacks

      Tree Chewed by Porcupine
      Can you spy the tree chewed by a porcupine? (Credit: John Davis)

      Why do we seem to have so many Porcupines in the Adirondacks?  I suspect this quilled rodent may be more abundant now than it was in earlier centuries because, unfortunately, our forebears exterminated Cougars and greatly reduced Fishers and Bobcats, the animals that eat Porcupines.  These days, the main killer of Porcupines is the automobile, with many of the dark slow rodents meeting a tragic demise crossing a road or licking salt from the side of the road at night.

      I sometimes puzzle when I see partially debarked trees, often American Beeches, high on a slope or ridge.  The gnawing can look much like that typically done by Beavers; and sometimes for a moment I think: how came a Beaver way up here so far from water?!  Then I realize (from the shallower chewing and the higher location) that the sculptor was the Beaver’s distant cousin the Porcupine, adding lighter colors to the grays and browns of tree trunks and branches. Sometimes, Porcupines, unlike other browsers, climb all the way to the tops of tall trees, especially hemlocks, but sometimes also hardwoods, to eat the more succulent tree branches or bark, sculpting more diversity into the forest.

      Coexisting with Quills

      Porcupine Eating by Larry Master (masterimages.org)
      Porcupine Eating by Larry Master (masterimages.org)

      I personally enjoy seeing Porcupines, and always chuckle when they show that embarrassed look, at unsuspectingly being spotted half-way up a tree.  Some of my neighbors don’t look upon Porcupines so favorably, however, because of their penchant for chewing wood — occasionally including wood that people have fashioned for their own purposes.  Having your porch supports gnawed by a Porcupine is annoying, I’ll grant; but there are benign ways (like wire mesh, hot pepper, or ammonia) to discourage rodents from chewing wood.  Having your dog quilled by a Porcupine is unhappy for all, and there the solution is simply restraint.  Quills are Porcupines’ self-defense, and we can’t reasonably blame the slow vegetarians for protecting themselves.

      I hope we will welcome Porcupines as being important members of our region’s forest communities.  I urge we also protect their mid-size natural predators, Fisher and Bobcat; and welcome home their largest native predator, the Cougar.  Collectively, these predators can keep Porcupine numbers in check, while allowing them to continue their arboreal sculpting.

      [Special thanks to Lake Placid-based nature conservation photographer Larry Master (www.masterimages.org) for permission to feature several of his photographs in this post.]

      Note: The content in this blog post was repurposed and a revised version is included in John Davis’s book Split Rock Wildway: Scouting the Adirondack Park’s Most Diverse Wildlife Corridor published by Essex Editions on Nov. 21, 2017. Learn more about the book and where to buy it at essexeditions.com. Watch the book trailer below. 

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      Filed Under: Nature Tagged With: Jerry Jenkins, keystone species, porcupine, porcupines, Wildlife, wildlife conservation

      About John Davis

      John Davis is a wildways scout, editor, and writer. He lives with his family in Split Rock Wildway, where he care-takes Hemlock Rock Wildlife Sanctuary when not roaming farther afield. He is a volunteer land steward for Eddy Foundation, which has secured and opened to the public about 3,000 acres in the eastern Adirondacks; a board member of Champlain Area Trails and other outdoor/wildlife organizations; a co-founder of Wildlands Network; and is the Executive Director of The Rewilding Institute. He is the editor of many conservation publications and author of Big, Wild, and Connected: Scouting an Eastern Wildway from Florida to Quebec—about his 7,600-mile traverse of the proposed Eastern Wildway in 2011. His 5,000-mile traverse of the Rocky Mountains from Sonora, Mexico, to British Columbia, Canada, is featured in the film Born to Rewild. His second book, Split Rock Wildway: Scouting the Adirondack Park’s Most Diverse Wildlife Corridor is a rambling look at some of the charismatic and enigmatic wildlife thriving in the wooded hills and adjacent waterways linking Lake Champlain with the High Peaks.

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