Habitat Moose require habitat with adequate edible plants (e.g., pond grasses, young trees and shrubs), cover from predators, and protection from extremely hot or cold weather. Moose travel among different habitats with the seasons to address these requirements. Moose are cold-adapted mammals with thickened skin, dense, heat-retaining coat, and a low surface:volume ratio, which provides excellent cold tolerance but poor heat tolerance. Moose survive hot weather by accessing shade or cooling wind, or by immersion in cool water. In hot weather, moose are often found wading or swimming in lakes or ponds. When heat-stressed, moose may fail to adequately forage in summer and may not gain adequate body fat to survive the winter. Also, moose cows may not calve without adequate summer weight gain. Moose require access to both young forest for browsing and mature forest for shelter and cover. Forest disturbed by fire and logging promotes the growth of fodder for moose. Moose also require access to mineral licks, safe places for calving and aquatic feeding sites. With reintroduction of bison into boreal forest, there was some concern that bison would compete with moose for winter habitat, and thereby worsen the population decline of moose. However, this does not appear to be a problem. Moose prefer sub-alpine shrublands in early winter, while bison prefer wet sedge valley meadowlands in early winter. In late winter, moose prefer river valleys with deciduous forest cover or alpine terrain above the tree line, while bison preferred wet sedge meadowlands or sunny southern grassy slopes.
North America After expanding for most of the 20th century, the moose population of North America has been in steep decline since the 1990s. Populations expanded greatly with improved habitat and protection, but now the moose population is declining rapidly. This decline has been attributed to opening of roads and landscapes into the northern range of moose, allowing deer to become populous in areas where they were not previously common. This encroachment by deer on moose habitat brought moose into contact with previously unfamiliar pathogens, including brainworm and liver fluke, and these parasites are believed to have contributed to the population decline of moose. In
North America, the moose range includes almost all of Canada (excluding the
arctic and
Vancouver Island), most of
Alaska, northern and eastern
North Dakota, northern
New England, the Adirondack Mountain region and Taconic highlands of northeast New York State, the upper
Rocky Mountains, northern
Minnesota, northern
Wisconsin,
Michigan's
Upper Peninsula, and
Isle Royale in
Lake Superior. In the West, moose populations extend across Canada (
British Columbia and
Alberta). Isolated groups have been verified as far south as the mountains of
Utah and
Colorado and as far west as the
Lake Wenatchee area of the
Washington Cascades. In the northwestern US, the range includes
Wyoming,
Montana,
Idaho, and smaller areas of
Washington, and
Oregon. Moose have extended their range southwards in the western Rocky Mountains, with initial sightings in
Yellowstone National Park in 1868, and then to the northern slope of the
Uinta Mountains in Utah in the first half of the twentieth century. This is the southernmost naturally established moose population in the United States. In northeastern North America, the
Eastern moose's history is very well documented: moose meat was a staple in the diet of indigenous peoples for centuries. The common name "moose" was brought into English from the word used by those who lived in present day coastal
Rhode Island. The indigenous people often used moose hides for leather and its meat as an ingredient in
pemmican, a type of dried jerky used as a source of sustenance in winter or on long journeys. The historical range of the subspecies extended from well into Quebec, the Maritimes, and Eastern Ontario south to include all of New England finally ending in the very northeastern tip of
Pennsylvania in the west, cutting off somewhere near the mouth of the
Hudson River in the south. The moose has been extinct in much of the eastern U.S. for as long as 150 years, due to colonial era overhunting and destruction of its habitat: Dutch, French, and British colonial sources all attest to its presence in the mid 17th century from Maine south to areas within of present-day Manhattan. However, by the 1870s, only a handful of moose existed in this entire region in very remote pockets of forest; less than 20% of suitable habitat remained. Since the 1980s, however, moose populations have rebounded, thanks to regrowth of plentiful food sources, Dispersals from Maine over the years have resulted in healthy, growing populations each in
Vermont and
New Hampshire, notably near bodies of water and as high up as above sea level in the mountains. In
Massachusetts, moose had gone extinct by 1870, but re-colonized the state in the 1960s, with the population expanding from Vermont and New Hampshire; by 2010, the population was estimated at 850–950. Moose reestablished populations in eastern
New York and
Connecticut and appeared headed south towards the
Catskill Mountains, a former habitat. In the Midwest U.S., moose are primarily limited to the upper
Great Lakes region, but strays, primarily immature males, have been found as far south as eastern Iowa. Moose were successfully introduced on
Newfoundland in 1878 and 1904, where they are now the dominant
ungulate. However, they are not native to Newfoundland, and their negative impacts on flora and fauna, including endemic species, is well documented. They have been somewhat less successfully on
Anticosti Island in the
Gulf of Saint Lawrence. File:Alaskan moose pair (6862339335).jpg|Cow and bull moose File:Cow moose.jpg|Cow moose File:Alces alces (juvenile).jpg|Moose calf
Decline in population Since the 1990s, moose populations have declined dramatically in much of
temperate North America, although they remain stable in
Arctic and
subarctic regions. The exact causes of specific die-offs are not determined, but most documented mortality events were due to wolf predation, bacterial infection due to injuries sustained from predators, and
parasites from
white-tailed deer to which moose have not developed a natural defense, such as
liver flukes,
brain worms and
winter tick infestations. Predation of moose calves by brown bear is also significant. Landscape change from salvage logging of forest damage caused by the mountain pine beetle has resulted in greater foraging in logged areas by female moose, and this is the lead hypothesis as to why the moose population is declining in eastern North American forests, as this likely leads to increased predation. An alternate hypotheses among biologists for generalized, non-hunting declines in moose populations at the southern extent of their range is increasing heat stress brought on by the rapid seasonal temperature upswings as a result of
human-induced climate change. Biologists studying moose populations typically use warm-season, heat-stress thresholds of between . However, the minor average temperature increase of 0.83–1.11 °C (1.5–2 °F), over the last 100 years, has resulted in milder winters that induce favorable conditions for ticks, parasites and other invasive species to flourish within the southern range of moose habitat in North America. The moose population in New Hampshire fell from 7,500 in the early 2000s to a 2014 estimate of 4,000 and in Vermont the numbers were down to 2,200 from a high of 5,000 animals in 2005. Much of the decline has been attributed to the winter tick, which, between 2017 and 2019, accounted for 74% of all winter mortality and 91% of winter calf deaths in Vermont. Moose with heavy tick infections will rub their fur down to the skin raw trying to get the ticks off, making them look white when their outer coat rubs off. Locals call them ghost moose. Loss of the insulating winter coat through attempts to rid the moose of winter tick increases the risk of hypothermia in winter.
Europe and Asia In Europe, moose are currently found in large numbers throughout Norway, Sweden, Finland, Latvia, Estonia, Poland, with more modest numbers in the southern Czech Republic, Belarus, and northern Ukraine. They are also widespread through Russia on up through the borders with Finland south towards the border with Estonia, Belarus and Ukraine and stretching far away eastwards to the
Yenisei River in
Siberia. The European moose was native to most temperate areas with suitable habitat on the continent and even Scotland from the end of the last Ice Age, as Europe had a mix of temperate boreal and deciduous forest. Up through Classical times, the species was certainly thriving in both Gaul and
Magna Germania, as it appears in military and hunting accounts of the age. However, as the Roman era faded into medieval times, the beast slowly disappeared: soon after the reign of
Charlemagne, the moose disappeared from France, where its range extended from Normandy in the north to the Pyrenees in the south. Farther east, it survived in
Alsace and the Netherlands until the 9th century as the marshlands in the latter were drained and the forests were cleared away for feudal lands in the former. It was gone from Switzerland by the year 1000, from the western Czech Republic by 1300, from
Mecklenburg in Germany by c. 1600, and from Hungary and the Caucasus since the 18th and 19th century, respectively. By the early 20th century, the last strongholds of the European moose appeared to be in Fennoscandian areas and patchy tracts of Russia, with a few migrants found in what is now Estonia and Lithuania. The USSR and Poland managed to restore portions of the range within its borders (such as the 1951 reintroduction into
Kampinos National Park and the later 1958 reintroduction in Belarus), but political complications limited the ability to reintroduce it to other portions of its range. Attempts in 1930 and again in 1967 in marshland north of Berlin were unsuccessful. At present in Poland, populations are recorded in the
Biebrza river valley, Kampinos, and in
Białowieża Forest. It has migrated into other parts of Eastern Europe and has been spotted in eastern and southern Germany. In 2008, two moose were reintroduced into the
Scottish Highlands in
Alladale Wilderness Reserve. The moose disappeared as a breeding species from Denmark about 4,500 years ago (in the last century, a very small number have lived for periods in
Zealand without establishing a population after swimming across the
Øresund from Sweden), but in 2016–17 ten were introduced to
Lille Vildmose from Sweden. In 2020, this population had increased to about 25 animals. The East Asian moose populations confine themselves mostly to the territory of Russia, with much smaller populations in Mongolia and Northeastern China. Moose populations are relatively stable in
Siberia and increasing on the
Kamchatka Peninsula. In Mongolia and China, where
poaching took a great toll on moose, forcing them to near extinction, they are protected, but enforcement of the policy is weak and demand for traditional medicines derived from deer parts is high. In 1978, the Regional Hunting Department transported 45 young moose to the center of Kamchatka. These moose were brought from
Chukotka, home to the largest moose on the planet. Kamchatka now regularly is responsible for the largest trophy moose shot around the world each season. As it is a fertile environment for moose, with a milder climate, less snow, and an abundance of food, moose quickly bred and settled along the valley of the
Kamchatka River and many surrounding regions. The population in the past 20 years has risen to over 2,900 animals. The size of the moose varies. Following
Bergmann's rule, population in the south (
A. a. cameloides) usually grow smaller, while moose in the north and northeast (
A. a. buturlini) can match the imposing sizes of the Alaskan moose (
A. a. gigas) and are prized by
trophy hunters.
New Zealand In 1900, an attempt to introduce moose into the
Hokitika area failed; then in 1910 ten moose (four bulls and six cows) were introduced into
Fiordland. This area is considered a less than suitable habitat, and subsequent low numbers of sightings and kills have led to some presumption of this population's failure. The last proven sighting of a moose in New Zealand was in 1952. However, a moose antler was found in 1972, and DNA tests showed that hair collected in 2002 was from a moose. There has been extensive searching, and while automated cameras failed to capture photographs, evidence was seen of bedding spots, browsing, and antler marks. == Evolutionary history ==