The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
HomeScience & NatureMammalDeer
Science & Nature • Mammal

Deer

Deer are hoofed ruminant mammals in the family Cervidae, an even-toed ungulate group that includes species such as white-tailed deer, moose, elk, and caribou.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Deer are hoofed ruminant mammals in the family Cervidae, an even-toed ungulate group that includes species such as white-tailed deer, moose, elk, and caribou. They are known for their slender build and, in most species, antlers that are shed and regrown annually. Deer occur naturally across much of the Northern Hemisphere and beyond, and several species are present in Canada.

Classification and evolution

Deer are even-toed ungulates in the family Cervidae. Sources differ on the exact number of living species, but commonly cited counts range from about 43 to 55 species across several genera and subfamilies.

Physical characteristics

Deer are typically slender, long-legged mammals with two large and two small hooves on each foot. Antlers are one of their most distinctive features and are shed and regrown annually in most species.

Behaviour and diet

Deer are ruminants with specialized digestion and are generally herbivorous. They browse and graze on plant material, and many species are active in forests and other vegetated habitats.

Distribution and habitat

Deer are native to Europe, Asia, North America, South America, and northern Africa, and many species have been introduced elsewhere. They occupy a wide range of habitats, including forests, tundra, deserts, swamps, and mountain slopes.

Deer in Canada

Canadian deer fauna includes white-tailed deer, mule deer, caribou, moose, and elk. These species are part of Canadian wildlife, ecology, hunting, and Indigenous and settler cultural histories.

Key facts

  • Deer belong to the family Cervidae within the order Artiodactyla.
  • Most male deer grow antlers; females of some species also grow antlers.
  • Deer are herbivores that feed on grasses, twigs, bark, shoots, and other plant material.
  • Five deer species are found in Canada: white-tailed deer, mule deer, caribou, moose, and elk.
  • Species vary widely in size, from small pudús to large moose.
🍁
Canadian context

Deer are important to Canadian wildlife and ecology, and five species occur in Canada: white-tailed deer, mule deer, caribou, moose, and elk.

Frequently asked questions

What are deer?
Deer are hoofed ruminant mammals in the family Cervidae, part of the even-toed ungulates.
Do all deer have antlers?
Most male deer grow antlers, and females of some species also do. The Chinese water deer is an exception among living deer species.
What do deer eat?
Deer are herbivores that eat grasses, twigs, bark, shoots, and other plant material.
Where do deer live?
Deer live in forests, tundra, deserts, swamps, and mountains, and are native to much of the Northern Hemisphere and South America.
How many deer species are there?
Published counts vary by source, with commonly cited totals ranging from about 43 to 55 extant species.
Which deer species are found in Canada?
Canada has white-tailed deer, mule deer, caribou, moose, and elk.

References

  1. Britannicahttps://www.britannica.com/animal/deer
    Supports: Deer are Cervidae in Artiodactyla; species count; antlers; distribution
  2. Encyclopedia.comhttps://www.encyclopedia.com/plants-and-animals/animals/vertebrate-zoology/deer
    Supports: Deer classification, family Cervidae, subfamilies
  3. The Canadian Encyclopediahttps://www.thecanadianencyclopedia.ca/en/article/deer
    Supports: Five deer species present in Canada
  4. PBS Naturehttps://www.pbs.org/wnet/nature/group/mammals/deer-mammals/
    Supports: Antler shedding, deer family traits, examples of species
  5. Britannica Kidshttps://kids.britannica.com/kids/article/deer/353044
    Supports: Diet, habitats, size range, antlers, general characteristics