Moose

• 1. Introduction

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  A bull moose shot along the Yukon River in September 1897 weighed 820 kilograms and stood 2.33 meters tall at the shoulder, the largest confirmed size ever recorded for the species. That single animal captures the extremes this creature is built for: it is the tallest and heaviest living species of deer on Earth, and the second largest land animal in North America behind only the American bison. Yet a moose survives largely on browsed leaves and pond weed, carries antlers that can regrow from nothing in three to five months, and can be provoked into charging a bystander it has never met. How does an animal built on this scale eat, breed, defend itself, and share the same cooling forests as wolves, brown bears and the occasional orca that hunts it?

• 2. The Antler Cycle

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  A bull moose's antlers start out as cylindrical beams projecting from each side of the skull, then fork, with the lower prong sometimes splitting again into two or three tines. Diet and age both shape how large and symmetrical those antlers become, and cows appear to select mates partly by antler size and symmetry, since bulls also use them to display dominance and to spar with rivals.

  Moose in Europe's northern range typically grow broad, flat, palmate antlers, while those farther south tend toward a smaller, twig-like dendritic pattern more like a typical deer, possibly because centuries of hunting favored bulls whose antlers were less prized. A study using a microphone found that a palmate antler works like a parabolic reflector, meaning moose with this broader antler shape can hear better than moose without antlers at all.

  A fresh set of antlers takes three to five months to fully develop after bulls drop the old set following the autumn mating season, making them among the fastest growing organs in the animal kingdom. Growth depends on an extensive network of blood vessels beneath a soft, hair-covered velvet layer, which bulls scrape off by September as intense grazing fuels the process. Immature bulls sometimes keep their antlers through the whole winter instead of shedding on schedule, and animals from birds to rodents to moose themselves gnaw on the shed antlers or the velvet for the protein inside.

  Castration, whether accidental or chemical, causes a bull to shed his antlers within two weeks and then regrow a permanently misshapen set that never sheds again, a condition that can also arise from testosterone deficiency linked to cryptorchidism or old age. Some of these grow into rounded, pearl-covered cactus antlers, while others become perukes, coral-like growths that keep expanding until they outgrow their own blood supply; among Inuit and other Indigenous groups of North America, these unusual antlers gave rise to legends about so-called devil's antlers.

  In extremely rare cases tied to a hormone imbalance, a cow moose can grow antlers of her own, a reminder that almost nothing about this animal's biology is entirely fixed.

• 3. Adapted To Water And Cold

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  The moose's oversized snout, unlike that of any other living deer, has nostrils that seal shut whenever the animal dips its head to browse underwater. That trait likely evolved for feeding on aquatic plants, and the same restructuring of the nasal passages gives moose a keen sense of smell, useful for finding water, sniffing out food buried under snow, and detecting mates or predators.

  A moose's two large front hooves, corresponding to its third and fourth toes, splay outward under body weight, spreading its footprint across soft ground, snow or open water and making swimming more efficient. Two smaller dewclaws sit higher on each foot, and the moose's weight per footprint sits roughly midway between the stiff, dewclaw-free foot of a pronghorn, built for speed, and the broad, large-dewclawed foot of a caribou, built for deep snow; a moose's footprint actually carries about twice the load per area that a caribou's does.

  Moose fur has four types of hair, including hollow guard hairs filled with air that both insulate the animal and help it float, layered over a soft woolly undercoat beneath. Both sexes also carry a dewlap, a loose fold of skin hanging under the chin, whose exact purpose remains unclear, though researchers have proposed cooling, a mating signal, or a dominance display similar to the antlers.

  An adult moose needs to eat about 23,000 kilocalories a day just to hold its weight steady, drawing most of that energy from land plants such as willow and birch shoots, which are naturally low in sodium. To make up the difference, moose fill roughly half their diet with aquatic plants like lilies and pondweed, sometimes diving more than 18 feet to reach vegetation on a lake bottom, something no other deer species is equipped to do underwater.

  That same need for salt and shade sometimes puts a moose out in the open, exactly where predators prefer to find it.

• 4. Predators And Defense

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  Siberian tigers are the only predator that regularly kills full-grown moose on its own, though a wolf pack can still bring one down, especially a cow traveling with a calf. Brown bears take moose of various sizes too and, in western Russia, supply around 15 percent of a brown bear's estimated annual dietary energy, making moose the bears' most important spring food source; even so, a brown bear is more likely to scavenge a wolf's kill or take a young moose than to hunt an adult alone.

  Black bears and cougars can be significant killers of calves in May and June and occasionally take an adult, usually a cow rather than a larger bull, while wolverines mostly scavenge moose carcasses but have killed moose weakened by harsh winters. Orcas are the moose's only confirmed marine predator, occasionally catching moose swimming between islands off North America's northwest coast, though such kills are rare and opportunistic; there is even one documented case of a moose carcass scavenged by a Greenland shark.

  Wolves typically trail moose at a distance of 100 to 400 meters, sometimes as far as 2 to 3 kilometers, and often drive them onto shallow streams or frozen rivers where footing worsens. A moose that stands its ground can charge or lash out with its hooves, and wolves usually kill by tearing at the haunches and perineum to cause massive blood loss, though a bite to the sensitive nose can paralyze a moose outright. Moose between two and eight years old are rarely killed by wolves, and while packs usually hunt moose together, there are documented cases of a single wolf killing a healthy, full-grown moose alone.

  Moose injure more people worldwide than any wild mammal except the hippopotamus, and attack more people than bears and wolves combined, though usually with only minor injuries. A charge is often preceded by warning signs: sustained eye contact signals the first stage of aggression, laid-back ears or a lowered head signal agitation, and raised hackles on the neck and shoulders mean a charge is imminent. One female moose is documented to have killed two adult male wolves, and moose are capable of kicking in any direction, including sideways, leaving no genuinely safe angle to approach from.

  Cows also use sound as a weapon of choice: a female that moans in protest while courted by a small bull draws the attention of larger males nearby, tilting the odds of mating toward the biggest bull in earshot.

• 5. Reproduction And Society

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  During the September and October rut, mature bulls stop eating entirely for roughly two weeks, a fast that researchers link to neurological changes tied to detecting moose urine and receptive cows by smell. Bulls also compete for access to females, grunting loudly enough to be heard from up to 500 meters away, while cows answer with a distinct wailing call; when two bulls meet, they typically size each other up first, and one often retreats before any physical fight begins.

  A cow moose carries her calf for about eight months before giving birth, usually to a single calf but sometimes to twins when food is abundant, with twinning rates reaching 30 to 40 percent in years of good nutrition. Newborn moose have a reddish coat that contrasts with the brown of an adult, and a calf stays with its mother until she chases it away just before the next calf arrives, typically around 18 months after the previous birth.

  Unlike most other deer, moose do not form herds; they live mostly solitary lives apart from the bond between a cow and her calf, though several animals may gather nearby during the rut. A moose typically lives 15 to 25 years, and populations tend to hold steady around 25 calves for every 100 cows at one year of age, a ratio that can climb sharply given mild weather, good food and low predation.

  Given enough of those favorable conditions, moose numbers can expand rapidly, exactly what happened across much of North America for most of the twentieth century, before the trend reversed.

• 6. Range And Decline

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  Moose range across nearly all of Canada outside the Arctic and Vancouver Island, most of Alaska, and pockets of the northern United States stretching from Minnesota and Michigan's Upper Peninsula to northern New England and the Adirondacks; isolated groups have turned up as far south as Utah and Colorado and as far west as Washington's Cascades. That range has been shrinking fast since the 1990s, largely because new roads opened moose territory to white-tailed deer, which carry parasites such as brainworm and liver fluke that moose have no natural defense against.

  New Hampshire's moose population fell from about 7,500 in the early 2000s to roughly 4,000 by 2014, and Vermont's dropped from a high of 5,000 in 2005 to about 2,200. Between 2017 and 2019, winter ticks alone caused 74 percent of Vermont's winter moose deaths and 91 percent of winter calf deaths; heavily infested moose rub their fur down to bare skin trying to remove the ticks, turning white enough that locals call them ghost moose.

  Colorado reintroduced a handful of breeding pairs in 1978, and the state's population has since grown past 2,400 animals, the southernmost naturally sustained moose population in the country. Massachusetts lost its moose entirely by 1870 but saw the species recolonize from Vermont and New Hampshire in the 1960s, reaching an estimated 850 to 950 animals by 2010.

  In Europe, moose vanished from France not long after Charlemagne's reign, from Switzerland by the year 1000, and from Hungary and the Caucasus by the 18th and 19th centuries, though Poland and Belarus later restored parts of the range through reintroductions in 1951 and 1958. Ten moose released into New Zealand's Fiordland in 1910 were followed by the last confirmed sighting in 1952, but a shed antler turned up in 1972, and DNA testing on hair collected in 2002 confirmed it came from a moose, evidence of a population nobody has ever actually filmed.

  Whatever is left of that hidden New Zealand population, if any, descends from a lineage that stretches back far deeper than any historical record, all the way into the Pliocene.

• 7. Ancient Relatives

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  The earliest known member of the moose lineage, Libralces gallicus, roamed the warm savannas of Pliocene Europe, with its best-preserved skeletons found in southern France. It stood 1.25 times larger than an Alaskan moose in linear dimensions, making it nearly twice as massive, yet it had a longer, narrower snout with none of the fleshy, developed nose modern moose rely on for feeding underwater.

  Libralces gallicus carried antlers built from a single horizontal bar 2.5 meters long with no tines, ending in small palmations, and its skull and neck suggest it fought by delivering high-speed impacts, more like a Dall sheep butting heads than a modern moose locking and twisting antlers with a rival. Its long legs point to an animal built for running fast across rough terrain, a very different strategy from its slower, browsing descendants.

  Sometime near the end of the Middle Pleistocene, Cervalces latifrons is thought to have evolved into the modern moose, probably somewhere in East Asia, with the earliest European fossils of the modern species dating to the early Late Pleistocene. The modern moose did not reach North America until around 15,000 years ago, near the very end of the Late Pleistocene, arriving as one of the last chapters in a lineage that had already been evolving for millions of years.

  Long before written history, that lineage was already being hunted: rock drawings and cave paintings across Europe show moose had been pursued by humans since the Stone Age.

• 8. A Long Human History

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  Excavations in Alby, Sweden, near the Stora Alvaret, uncovered moose antlers inside wooden hut remains dating to around 6000 BC, some of the earliest evidence of moose hunting in northern Europe. Hunters across northern Scandinavia built trapping pits up to 4 by 7 meters wide and 2 meters deep, camouflaged with branches and lined with steep, plank-covered sides so a fallen moose could not climb back out; wooden fences found in nearby bogs once guided animals toward these pits, and Norway has dated one such system to around 3700 BC. The method proved so effective that Norway's government tried restricting it as early as the 16th century, though people kept using it into the 19th.

  Julius Caesar gave the earliest written description of the moose in his Commentarii de Bello Gallico, claiming the animal had no leg joints and slept leaning against trees, so hunters could topple it by cutting partway through the trunks it favored. Writing more than a century later in his Natural History, Pliny the Elder repeated a similar story about a creature called the achlis, which he said resembled the moose but also lacked joints in its hind legs and had to walk backward while grazing because its upper lip was too large.

  Henry David Thoreau, in The Maine Woods, described moose meat as tasting "like tender beef, with perhaps more flavour; sometimes like veal," and the meat does carry protein levels similar to beef or wapiti alongside a lower fat content weighted more toward polyunsaturated fat. Not every part is safe to eat in quantity, though: Finland bans anyone from eating the liver or kidneys of moose older than a year because cadmium levels run too high, and Ontario's government has issued the same warning after finding cadmium levels well above those measured in Scandinavia.

  A moose's center of mass sits above the hood of most passenger cars, so a collision crushes the front roof beams straight into the occupants, a crash pattern that seatbelts and airbags do little to prevent; taller vehicles like trucks fare much better because the damage stays confined to the front end. A Massachusetts study found that vehicle strikes killed 3 percent of the state's entire moose population every year, and Norway's rail authority estimated roughly 13,000 moose died in collisions with trains nationwide between 2000 and 2008.

  The Soviet Union began experimenting with moose domestication before World War II, and a program launched at the Kostroma Moose Farm in 1963 still keeps a herd of tamed animals today, numbering 33 as of 2003, funded partly by selling moose milk and hosting visiting tourists. Sweden once debated putting moose to more practical use too, floating 18th century proposals for moose-drawn mail routes and even a moose-mounted cavalry. Those plans stayed on paper, but the farm at Kostroma is still standing, still breeding moose, and still collecting milk from animals that in the wild answer to no one.