Critter Curriculum vtfishandwildlife.com
Moose photo
Moose Alces alces

Physical Characteristics
Moose are the largest member of the deer family (cervidae) which includes white- tailed deer, elk and caribou. They are tall animals with long legs, short neck, high hump on the shoulders, very short tail and a small rump. An adult can stand from 5 to 6½ feet tall at the shoulder and can weigh from 600 to 1400 pounds, with a maximum weight attained in the fall. On average a moose’s belly is 35 inches off the ground, twice as high as a deer’s, and its front feet can be lifted nearly shoulder high, enabling it to travel easily over fallen trees and through deep snow. The head is long with an even longer nose and large ears. There is a slight mane on the neck and shoulders, and both males and females have a dewlap of skin and hair (called a bell) hanging from the underside of the throat. The bell, which is larger in males than in females, may aid in dispersing scents (called pheromones) given off by the various glands of the animals.

The front legs are longer than the hind legs, which make the gait awkward, but help in jumping over fallen trees. The hooves are long, narrow, and pointed, leaving a heart-shaped track approximately 5 inches long. Antlers are present only in bulls (males) and are strongly palmate (resembling a hand with spread fingers) in adults. They are bone-like structures which grow from a pedicle (outgrowth of the skull) on each side of the head. Antlers begin to grow in late March or April. As they are forming they are covered by a hairy skin layer (called velvet) that is nourished by small blood vessels. Moose antlers grow at an amazing rate, sometimes over one-half inch per day. In late August or early September the antlers stop growing and the velvet is rubbed off. Upon exposure the antlers are white with blood stains but eventually become dark tan in color. The bone recedes between the pedicle and the base of the antler until the antler is shed. This occurs in November or December for large bulls but can be as late as April on young bulls. Antler width, beam diameter, and number of points will grow larger each year until a bull is 5 years old, after which antler size begins to decline.

Coloration of adult moose may range from light tan to almost black depending on age and season. The new spring coat is blackish-brown and grayish- brown, paler on the head. Adult males exhibit a darker nose than females. The belly and legs are lighter in color than the rest of the body. Natural bleaching and hair breakage results in gradual lightening of the entire hair coat during the year. Females have a white patch of hair under their tail. Calves are reddish brown when born and do not have spots like deer fawns.

Distribution
Moose primarily inhabit the northern evergreen (boreal) forests and tundra regions of the world including Europe, Asia and North America. In the eastern United States they are found in New England, New York, northern Wisconsin, Michigan and Minnesota. They are also found throughout Alaska, Canada and parts of the Rocky Mountains from Idaho to Colorado. Moose occur sighted throughout much of Vermont but are most numerous in the Northeast Kingdom (Orleans, Essex, Caledonia Counties) and along the spine of the Green Mountains from Canada to the Massachusetts state line. The Vermont moose population is relatively stable at around 3,000 animals.

Reproduction/Mortality
The breeding or rutting season for moose occurs from mid-September through mid- October. Bulls are capable of breeding during their second fall when they are known as yearlings, but most breeding is done by older, more dominant bulls. Although both sexes usually remain within a 10 square mile area throughout the year, young bulls may move much farther during the rut. Bulls in the rut will thrash trees and shrubs with their antlers and dig pits in the ground into which they urinate and spread scent. Cow moose are attracted to these pits, and bulls will constantly travel to their various pits checking for the presence of cows. Bulls are also aided in their search by the loud “bellowing” call of the cow in heat. Strenuous shoving matches between bulls may occur to establish dominance for breeding. If accepted by a cow the dominant bull will stay with her for up to a week. In forested habitats such as Vermont has, each bull will probably breed only a few cows before all cows pass through their “heat” or “estrus” period.

Some cows have their first calves at 2 years of age but most will not calve until age 3. Cows between the ages of 3 and 9 are more likely to have twins than are 2 year-old cows, which generally give birth to only one calf. The pregnancy period for a moose is about 243 days and most calves are born in mid- to late May. Calves weigh 25 to 35 pounds at birth and grow very rapidly, gaining one pound per day during the first month and 2-3 pounds per day during the second month. Calves are generally weaned by mid-October, at which time they weigh 300 to 400 pounds. A durable bond is formed between cows and their calves, which will last until the following spring when new calves are born.

Moose are prolific. In healthy populations most adult cows (2+ year-olds) are bred, and over half may give birth to twins. Up to 50% of yearling cows may also breed, especially on good habitat but generally only one calf will be born. Under ideal conditions moose populations may expand by 20% to 25% annually and dramatic increases have occurred when moose occupy new habitats, especially in the absence of major predators. For example, 31 moose stocked in one area of Colorado in 1978-1979 had increased to a herd of 170 by 1988, even with losses to poaching. Increased cutting of forests in Scandinavia contributed to moose population explosions in the 1970s. The moose population in Finland grew from 15,000 in 1969 to 100,000 in 1980. At the same time, hunter harvests increased from 5,000 to 50,000 moose annually.

Moose numbers eventually will decline, however, if population growth continues unchecked, usually as a result of malnutrition caused by overbrowsing on winter range. Poor winter range causes both increased mortality and reduced reproductive rates. A classic example of such a population crash occurred at Isle Royale in Michigan where a 1930 population of between 1,000 and 3,000 moose over browsed their range and declined to less than 200 by 1935.

The primary known cause of non-hunting moose deaths (mortalities) in Vermont is motor vehicles. Since the beginning of Vermont’s moose study in September 1980 nearly 70% of these reported mortalities were due to collisions with motor vehicles. Another 9% were losses by illegal shooting (poaching) and the remaining were due to a variety of causes such as accidents, suspected brainworm and train kills. It is unknown how many moose are lost annually to predation but it’s likely that calves are occasionally killed by bears and coyotes.

The brainworm is a small worm that lives in deer and moose. Because the worm evolved with deer it apparently does the deer no harm. Moose on the other hand, may have only recently been exposed to the worm because of northward expansion of deer range over the last century. Moose are abnormal hosts of brainworm and it does them great harm. The life cycle of the brainworm includes several stages. The larval stage of the worm is expelled in deer droppings. Snails feeding on the droppings inadvertently ingest the worm larvae and become an intermediate host for the worm. The moose in turn becomes infected after unwittingly ingesting the snails while feeding on plants. The larvae migrate along the spinal cord to the moose’s brain sometimes destroying the spinal cord as well as brain tissue. The moose may then display symptoms such as loss of balance, circling, lack of fear, blindness and paralysis. The disease generally causes the eventual death of the moose.

Habitat Requirements
Moose use different habitats from summer to winter. They are excellent swimmers and are frequently seen feeding on water plants in ponds during summer. Moose can dive up to 18 feet for these preferred foods which are sought because they have high concentrations of macroelements such as sodium, calcium and phosphorus. These macroelements are important for antler development, lactation and body growth. During the hot months moose can suffer from overheating and must have access to dense shade or cooling waters. For these reasons, lowland softwood forests, beaver ponds and other shallow bodies of water are favorite spring and summer habitats for moose.

Moose are generally not a social species but several may be seen together especially at preferred feeding sites. Clearcuts are used throughout the year with the animals moving to hardwoods located near softwood cover in the fall. These forest types usually provide more winter food, especially in recently cut-over areas. Moose will seek softwood shelter when snow depths reach approximately 35 inches, the snow gets a heavy crust, or during extreme cold and windy conditions.

Food Habits
In Algonquin the word ‘moose’ means “eater of twigs”. Indeed, moose are mainly browsers, eating the new leaves and twig growth of trees and shrubs. They also graze on grasses, forbs, lichens and mushrooms, occasionally kneeling to do so. Tender shoots of water lilies and other aquatic plants are preferred summer foods when available but moose are not dependent on them. After the fall frosts and winter snows either kill or deeply bury non-woody (herbaceous) foods, moose must turn to woody twigs for food. Foods consumed by wintering moose vary, depending on preference and availability. Moose in the Northeast often browse on aspens; red, mountain, and striped maple; grey and white birch; willow; ash; pin cherry; hobblebush; and balsam fir. Moose also will strip and eat the soft bark of mountain ash and red, mountain and striped maples.

Moose and other closely related wildlife such as deer and elk like to feed at salt licks. At these areas moose lick or eat soil which has a high concentration of minerals such as sodium and calcium. Historically, naturally occurring salt licks were known to North American Indians and colonists as good hunting areas for large mammals. With the advent of civilization a new type of salt lick has developed. These man-made licks occur where road-salt runoff accumulates in the soil. The attraction of moose to these roadside salt licks often creates a hazard to both moose and motorists.

Interactions with Humans
Like humans moose need space to live, but their presence on some properties is not always welcome. Some farmers have been upset with moose walking through fences or tubing in their sugarbush. Others have grown tired of the nuisance created by an occasional bull moose associating with their livestock.

High moose densities have been known to cause serious concern to timberland owners. For example, moose densities above six per square mile were shown to severely damage regenerating trees in Newfoundland during the 1960s and similar damage to young scotch pine trees has occurred more recently in Sweden. There has been no widespread concern expressed yet by industrial timber companies in Vermont, although moose have caused localized damage to regenerating balsam fir.

Moose that wander into villages and more urban areas create an element of risk to the public. Often these moose are suspected to be suffering from brainworm infections which may contribute to their lack of fear of humans. In one freak incident in downtown Burlington a moose suffering from an abnormal growth of one antler into its eye posed a physical threat to curious onlookers.

Moose present a serious road hazard, especially when their range is densely populated by humans, and Vermont’s human population density is relatively high compared to most moose ranges across North America. Vehicle collisions with moose are a serious concern in northern New England and were a principal reason that moose population growth in Finland and Sweden was halted in the 1990’s.

Vermont motorists, especially in Essex County, must always be on guard when traveling - particularly at dawn and dusk. Many have suffered extensive vehicle damage and eighteen people have lost their lives in collisions with moose in Vermont. “Moose Crossing” warning signs on Vermont highways should be seriously heeded by motorists. It is wise to reduce speed to 40 mph or lower when traveling through these areas, especially during the non-winter months.

Moose Viewing
Not all moose/human interactions are negative of course. On the contrary, thousands of Vermonter’s and tourists enjoy the thrill of seeing a moose, whether on their commute to work, from their deer-hunting stand, or while making a special trip to prime moose viewing sites. We are fortunate that Vermont’s largest wild animal is also one that can be easily viewed, especially during the spring and summer. Roadside salt licks are frequented by moose as soon as the snow cover melts in the springtime. The best times of day for finding a moose in a lick are at dawn and dusk. Moose also are easily viewed while feeding in open wetlands from June through September.

Although moose may often allow cars and pedestrians to approach closely while feeding at licks or ponds, moose viewers should never forget that they are watching a big, powerful, wild animal. Moose can cover a short distance in seconds, and a cow with a young calf or a rutting bull can be especially dangerous. It is wise to always keep a safe distance while viewing or photographing moose. Heavily- used salt lick areas are generally marked with moose crossing warning signs. For best viewing chances, look for salt licks near these signs in Essex County along Vermont State Highway 114 from East Burke to Canaan, or 105 from Island Pond to Bloomfield.

Interactions with Deer
Moose and deer feed on many of the same plants. Concerns have been expressed by some Vermonters that the growth of the state’s moose herd reduced available deer foods, resulting in a decline of deer numbers. Several scientific studies conducted in Alaska and Canada, however, have shown that competition for foods between the two species is minimal, especially during the winter. Moose are able to winter in more open cover types than deer because they can travel through deep snow more easily. While a few Vermont moose have been observed wintering in deer winter range, the vast majority appear to winter at higher elevations where browse is more abundant.

There have been only a few studies of summer and fall range relationships of deer and moose. The results indicate that during non-snow months deer and moose have similar habitats. There is a tendency, however, for moose to be found in open hardwoods more frequently than deer, and for deer to prefer mixed hardwood/softwood types. In either case, in Vermont there is generally an adequate supply of browse for both deer and moose on non- wintering range at present population levels.

Scientific evidence to date indicates that deer are detrimental to moose and not vice versa. The brainworm is the culprit, for it is only where moose and deer ranges overlap that moose are found dying of the disease. Although the reported evidence of brainworm in Vermont moose has been low, it is likely that it has more of an impact in areas of the state with low moose yet high deer densities.

History of Moose in Vermont
Historically, moose were plentiful in Vermont, and many settlers relied heavily on moose for food. However, uncontrolled hunting, combined with habitat loss due to farm land clearing, eliminated moose from all but Essex County by the 1840s. By the mid 1870s nearly 75% of Vermont was deforested and moose were very rarely seen even in the Northeast Kingdom. This land use change had an additional, indirect impact on moose habitat - the loss of beaver ponds. Through their dam-building activities, beavers create shallow wetlands that provide moose with abundant and nutritious summer foods. Unregulated trapping and the loss of forest habitat combined to virtually exterminate beavers in Vermont during the nineteenth century.

Moose sightings remained very low throughout much of the 20th century, with most reports coming from Essex County. It was not until the 1970s that Vermont’s moose population really began to expand.

There are several probable causes for the recent growth of Vermont’s moose herd. The forests and wetlands used by moose increased in Vermont during the 20th century. Today
approximately 80% of the state is forested. Wetland habitats favorable to moose began increasing in 1932 when beavers trapped in Maine were released in Caledonia County and eventually throughout Vermont. Those restocking efforts, regrowth of the forest, and trapping regulations have resulted in the current widespread distribution of beaver ponds in Vermont.

Moose populations in Maine were also reduced in the early part of the 20th century, leading to the closure of their hunting season in 1950.  As a result, Maine’s moose populations grew steadily over the next 30 years and in 1980 the hunting season was reopened.  The growth of moose populations in Maine during this time led to increased numbers of moose traveling into northern New Hampshire and Vermont in search of new habitats.   At the same time forest cutting increased in northeastern Vermont as landowners harvested maturing timber, resulting in an abundance of browse for moose.

Moose increased in number and spread to suitable habitat throughout the state in the 1980s. Since 1980 moose report cards have been used by state and federal field personnel to document mortalities, sightings of moose, or moose sign such as tracks, droppings or tree-barking. These reports showed that moose occurred in 117 towns by 1984. By 1999, however, the number had increased to 235 towns.

The increasing trend in known incidental mortalities (such as road kills) suggested that our moose herd grew by 10 to 15% each year during the 1980s and 90s. Vermont’s moose population is currently well established in the northeastern and mountainous regions, with lower numbers in the foothills and Connecticut River Valley. The largely agricultural landscape of the Champlain Valley does not provide good moose habitat and sightings are infrequent in Grand Isle and western portions of Franklin and Addison counties.

Management of Vermont’s Moose Population
The management of Vermont’s moose technically began in 1896 when a law was first passed affording the species complete protection. Modern moose management began in Vermont in 1992 with the adoption of a Moose Management Plan. The plan was developed by the Vermont Fish & Wildlife Department from biological data derived from studies conducted in Vermont since the early 1980s, applicable results of studies conducted in nearby States and Provinces of Canada, and public opinion derived from a series of public meetings held throughout the State in 1991 and 1992. This plan was updated in 1998 and again in 2010.  The current plan can be viewed on the department's online library.

The department is required by law to protect and manage all wildlife species in the state. Our mission includes the goal to “provide a variety of high- quality fish and wildlife-based outdoor recreation opportunities compatible with the ecological integrity of affected resources”. Many Vermonters and tourists enjoy the thrill of observing or photographing moose. Others are pleased just to know moose are doing well in Vermont and may have no desire to “use” moose in any sense of the word. As far back as 1980, some sportsmen expressed a desire to legally hunt moose, and several bills to that effect were introduced into the legislature. The department opposed these proposed bills until 1991 when the biological data indicated a limited moose hunting season was possible. Moose population management through regulated hunting is an important component of the Moose Management Plan. Moose hunting in Vermont is regulated by a special license and is limited to a specific area with a specific number of licenses for the area determined annually. The license allows a party of up to 2 hunters and a guide to take 1 moose during the season beginning on the 3rd Saturday in October. Hunters are selected by random draw from a large pool of applicants. If experience shows that more female moose need to be taken to achieve an area- specific population goal, the department allocates some of the licenses in an area to that purpose.

Vermont’s first modern moose season was held in 1993 in the Essex County area where 25 moose were taken under 30 permits. Since that first year, moose hunting has expanded to 17 WMUs comprising 78% of the State.

In the first decade of modern moose management in Vermont, the department chose to be deliberately conservative, slowly expanding hunting units and in establishing license numbers.  By the beginning of the 21st century, however, moose populations in the Northeast Kingdom region were causing significant damage to forest regeneration and large increases in permit numbers were prescribed for these units beginning in 2004.  It was estimated that the moose density in WMU E was double the target level which had been set at the 1996 population density estimate of 1.75 moose/ mi2. Moose densities well over 3/mi2  in this unit  were over-browsing forest regeneration not only to their own detriment but also to the detriment of other wildlife species that utilize low growing trees and shrubs for food and cover.  Landowners, especially large industrial forestland owners whose livelihood and investment depends on a healthy and growing forest, were especially anxious to see moose densities reduced.  After several years of very high permit allocations, the populations in D2 and E were brought down to or even below target densities and annual permit allocations have returned to normal levels. 

A special archery-only moose season was initiated in 2011.  Fifty permits are allocated via lottery for this 7-day season which begins during the peak of the rut on October 1.    The archery harvest has a negligible effect on the moose population, and consequently archery permits do not diminish the regular season permit quotas for any WMU.

Future
Vermont’s new Big Game Management Plan 2010 – 2020 calls for maintaining moose densities of between 1.0 and 1.75 moose/mi2 in specified areas (wildlife management units) in the Northeast Kingdom. Moose densities in most other units will be held below 0.5 moose/mi2, and the statewide population will be maintained between 3,000 and 5,000 moose.

Biological data and public desires will continue to be used to guide future moose management.  The physical characteristics and age structure of the herd will be closely monitored to ensure that reproductive levels are healthy and that large-antlered, prime bulls are available for viewing and photographing. With careful management, moose will continue to be an important, fascinating and enjoyable component of Vermont’s wildlife resource.