Elk
- Male North American elk have the largest antlers of any modern mammals. Their span reaches 180 cm, and their weight is 20–30 kg.
- Lactation in North American elk lasts 3.5–4 months; their milk has a fat content of 8–13%, three to four times higher than cow's milk, and contains five times more protein (12–16%).
- The North American elk can run at speeds up to 56 km/h and is a good swimmer.
- In winter, North American elk lie in loose snow so that only their head and hump are visible above the snow, which reduces heat loss.
- Unlike most deer, the moose is a conditional monogamist and rarely mates with more than one female.
- During the mating season, male moose engage in fights, sometimes to the death. They are aggressive and may attack humans.
- Calves are born and can walk within an hour.
- Males have enormous palmate antlers that they shed annually.
- In areas where the snow cover reaches 70 cm, elk migrate to less snowy areas during winter. In places with snow cover of 30–50 cm, elk live sedentarily.
- The moose is the largest member of the deer family.
- The moose can dive to 5–6 m for aquatic plants.
Age
The Eurasian elk and North American elk have a typical lifespan ranging from 19 years and 2 months to 31 years and 11 months, although the maximum recorded lifespan is 27 years, with a theoretical lifespan between 17 years and 11 months and 25 years and 7 months. The species reaches sexual maturity between 1 year and 7 months and 2 years and 7 months of age, and the young are born with their eyes open and begin walking immediately. During the embryonic stage, the fetus develops inside the mother and receives nourishment via the placenta. The calf stage follows, where the young consume milk and learn to forage for plants, lasting from 1 day to 6 months. Subsequently, the adult stage begins, lasting from 2 years to 21 years and 11 months, during which the elk independently obtains food and participates in reproduction.
Phenotype
The skin and fur of the species develop by the end of the embryonic period. Young elk have thick fur that protects them from the cold, and their long, strong legs allow for rapid running and walking through deep snow. Adult elk possess thick fur with an undercoat that provides good protection from frost, and they have massive antlers with wide plates used to attract females and engage in battles with rivals. The species also has wide hooves that prevent sinking in snow and aid in swimming, and the large, flexible upper lip helps to tear off leaves and aquatic plants.
Physiology
The Eurasian elk and North American elk have body lengths ranging from 1.5 to 2.1 meters, with weights between 0.35 and 0.38 metric tons; the species’ embryonic stage features bodies weighing from 1 gram to 15 kilograms and measuring from 1 millimeter to 70 centimeters in length, while the young have body weights of 15 to 120 kilograms and lengths from 80 centimeters to 1.4 meters; adult individuals weigh from 0.32 to 0.6 metric tons and measure 1.7 to 2.1 meters in length.
Habitat
Eurasian elk and North American elk inhabit terrestrial landscapes including highlands, tundra, and forests; the species’ elevation range extends up to 2 kilometers above sea level. They are found in taiga biomes characterized by cold winters and an abundance of coniferous trees such as spruce and pine, flooded meadows with plentiful grass where water frequently inundates the ground, and temperate mixed forests featuring oak, birch, and maple trees. The climate varies, with cool summers averaging between 15 and 20 degrees Celsius, frequent rainfall creating consistently humid conditions, and winters marked by heavy snowfall and cold temperatures; some areas experience warm summers alongside abundant rainfall and winter snow.
Shelter
The Eurasian elk and North American elk do not have permanent or long-term shelters. The species finds shelter under dense spruce trees or in thick willow thickets, and does not have a fixed refuge. Materials used for shelter include aquatic plants, grass, and bark. These materials provide protection from wind, a place to rest, and shielding from the sun.
Geography
The Eurasian elk and North American elk are found within the biogeographical realms of Nearctica and Palearctica. The species occupies ecosystems including Sarmatian mixed forests, Scandinavian mountain birch forests and meadows, the Kazakh forest-steppe, the Ural mountain forests and taiga, the Scandinavian-Russian taiga, and the West Siberian taiga.
Feeding
The Eurasian elk and North American elk consume only plants, including leaves of trees and shrubs, aquatic plants in summer, and branches, bark, and dry grass in winter; the species obtains food by tearing at plants with its front teeth, and its diet consists of tree leaves, willow and birch shoots, bark, aquatic plants, grass, algae, young shoots, and sprouts. The elk’s feeding strategy involves searching for and obtaining food, with a daily food requirement ranging from 15 kilograms to 30 kilograms. Young elks are fed milk, while bears prey on the species.
Reproduction
The Eurasian elk and North American elk are terrestrial animals that develop on land, away from bodies of water, and their young develop in nests built on or near the ground. Reproduction occurs through homogamy, always involving fertilization without generation changes; the female reaches maturity at an age between 2 and 4 years. After mating, the female carries one or two calves for approximately 8 months, giving birth to live young on land. A litter has 1–2 young, and newborns remain with their mother for over a year. The species has a reproductive interval of 1 year; in autumn, males fight for females. Only the mother demonstrates parental care within a ground nest located directly on the surface of the land.