by Roland D. Hallee

Porcupines. Nuisance, or ecological necessity?

It all depends with whom you talk. I know some people who are overrun by the animals to the point where they are raiding the gardens, and having to deal with their dogs being injured by porcupine quills due mostly to their own curiosity. While others find a use for them.

Simply put, porcupines are rodents. That puts them in the same class, and are actually related, with raccoons, rats and beavers. They are indigenous to the Americas, Southern Asia, Europe and Africa. They are the third largest of the rodents, behind the capybara and beaver. They can grow in size to be 25 – 36 inches long with an 8 to 10-inch tail, and weigh from 12 – 35 pounds.

The common porcupine, Erethizon dorsatum, is an herbivore, so look out gardens. It eats leaves, herbs, twigs and green plants. They may eat bark in the winter, evidence of which I have seen in many places. The North American porcupine often climbs trees to find food. Like the raccoon, they are mostly nocturnal, but will sometimes forage for food in the day.

Because of the scarcity of predators, porcupines are plentiful and are not endangered.

The name porcupine comes from Middle French porc espin (spined pig). A regional American name for the animal is quill pig.

The porcupines’ quills, or spines, take on various forms, depending on the species, but all are modified hairs coated with thick plates of keratin, and they are embedded in the skin.

Quills are released by contact with them, or they may drop out when the porcupine shakes its body. The porcupine does not throw quills, but the flailing muscular tail and powerful body may help impel quills deeply into attackers. The quills’ barbed ends expand with moisture and continue to work deeper into flesh. Porcupine quills have mildly antibiotic properties and thus are not infectious. Quills, however, may cause death in animals if they puncture a vital organ or if a muzzle full of quills leads to starvation.

Once embedded, the hollow quills swell, burn and work their way into the flesh every time a victim’s muscles contract, digging a millimeter deeper each hour. Eventually, they emerge through the skin again, some distance from the entry point though sometimes they spear right through the body.

I have had first hand knowledge of how painful a porcupine quill can be. Many years ago, my children had chores to do after they got home from school. One of them was to make sure they picked up after themselves following their after-school snack. Upon returning home from work, I found a folded paper towel on the counter. I grabbed it to crush it into a ball to throw away when this sharp pain shot through my hand. When I unwrapped the towel, I found a porcupine quill inside, but now imbedded in my hand. It turned out my daughter had brought it home from school to show it to me. She obtained the quill from a “show and tell” session at school.

Because they have few effective predators, porcupines are relatively long-lived. The average life span of the porcupine is 7 – 8 years, however, they have lived up to 15 years in the wild, and 18 years in captivity. A predator needs to learn only once to leave a porcupine alone. Bobcats, great-horned owls, mountain lions, coyotes and wolves, when extremely hungry and unable to catch anything else, may give it a try anyway. The fisher, however, is a skilled porcupine killer. It uses its speed and agility to snake around a porcupine’s rear guard defense and viciously bite its face until it dies.

At one time, however, especially when game was scarce, the porcupine was hunted for its meat and considered a delicacy. A practice that continues in Kenya today. Because they are slow, and can remain in the same tree for days at a time, they are about the only animal that can be killed simply with a large rock. Native people of the North Woods also wove elaborate dyed quillwork decorations into clothing, moccasins, belts, mats, necklaces, bracelets and bags. Because the work was so time-consuming and highly valued, quill embroderies were used as a medium of exchange before the coming of Europeans.

When not in trees or feeding, porcupines prefer the protection of a den, which can be found in rock crevices, caves, hollow logs, abandoned mines and even under houses and barns.

Porcupines are highly attracted to salt. They may chew on any tool handle that has salt left from human sweat. They have even been known to chew on outhouse toilet seats. Road rock salt is very tempting to them, and puddles of water from the snow-melt in the spring are especially luring and could account for their high road-kill mortality rate. They have even been seen gnawing on automobile tires that have been exposed to rock salt.

In Maine, porcupines join a short list of other animals that are open to hunting all year, including coyotes, woodchucks and red squirrels.

So, are porcupines a nuisance, or do they have a role in the grand scheme of things, ecologically?

Roland’s trivia question of the week:

Who is the only player in New York Yankees history to achieve over 3,000 hits in his career?

Answer can be found here.

 

by Roland D. Hallee

A couple of weeks ago, during a discussion with associates, the subject of the brown-tail moth came up. I figured it was just another of the mundane moths we see during the summer. However, that was not the case. This particular moth, Euproctis chrysorrhoea, is one that we probably could do without.

This moth, once native only to Europe, was accidentally brought to Massachusetts in 1897 on nursery stock, and soon spread to the rest of New England, Today, it is found only on Cape Cod and along the coast of Maine, where it is considered an invasive species.

The brown-tail moth is armed with defensive barbed hairs throughout its life span but especially during the caterpillar stage. These hairs break off, and for many people exposed, are susceptible to skin rashes, headaches, and even difficulty breathing. This caterpillar also has a huge host range of plants on which they feed.

The brown-tail moth caterpillar has tiny poisonous hairs that cause rashes similar to poison ivy on sensitive individuals. Rashes may develop when people come in direct contact with the caterpillar or indirectly from airborne hairs. The hairs become airborne by either being dislodged from living or dead caterpillars, or they come from cast skins when the caterpillar molts. Respiratory distress from inhaling the hairs can be serious.

Caterpillars are active from April to late June. Hairs remain toxic throughout the summer but get washed into the soil and are less of problem over time.

The moths, which are attracted to light and fly at night, and active in July and August, have a wingspan of about 1.5 inches. The wings and midsection are solid white on both the male and female. The abdomen has brown on it, and the brown coloration extends along most of the upper surface of the abdomen in the male, whereas the top of the abdomen is white on the female, but the tuft of brown hairs are much larger.

The factors underlying brown-tail moth population dynamics are little understood and have been only thoroughly investigated by few researchers.

According to the Coastal Pharmacy & Wellness staff, the brown-tail moth has been getting plenty of attention over the past few years. This is because the numbers have spiked to levels that haven’t been seen in quite some time. Last year was a banner year and this year’s population is predicted to be even higher.

Throughout much of its life cycle, the moth sheds its toxic hairs. Eggs are laid in August-September, when a female can lay up to 400 eggs. They build their winter nest in the fall and remain there from September to June. In June and July, the larvae spin cocoons in which to pupate. The cocoons are full of toxic hairs. The moth emerges in July and August, mate and lay eggs to begin a new cycle. During this period, more hairs are shed to cover the egg mass.

The brown-tail moth’s excessive desire to eat, and its habit of feeding on many different kinds of foods, together with its tendency to reach outbreak densities, makes this species a major pest of hardwood forests and may also attack fruit and ornamental trees.

According to the Coastal Pharmacy and Wellness staff, moth spray or lotion, to combat the rash, are available by prescription from your doctor. There is no antidote for the toxins, so treatment is focused on relieving symptoms and eliminating further exposure. “Since many reactions occur over weekends, seeing a doctor may not be immediately possible. In these cases, you may find relief by soaking in a warm bath and applying calamine lotion or antihistamine cream.”

Pursuant to Maine Statute Title 22§1444 the Chief Operating Officer of the Maine Center for Disease Control can declare an infestation of brown-tail moths as a public health nuisance. The declaration may be made on the COO’s initiative or upon petition by municipal officers.

Roland’s trivia question of the week:

With his win in game five of the 2013 World Series, Jon Lester of the Boston Red Sox became only the second Red Sox left-handed pitcher to win three World Series games. Who was the first?

Answer can be found here.