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mammals

Mammals are an important group of vertebrates characterized by the presence of mothers feeding their offspring. Notable characteristics of mammals include lactation, body hair, endothermy (warm-blooded animals), and a four-chambered heart. There are many species of mammals, living in almost all ecosystems on Earth, from the deep sea to the mountains, from tropical rainforests to the cold polar regions.

  • scientific name:Mammalia

  • Features

    • suckle:Females have mammary glands that secrete milk to feed their young.

    • Body hair:Most mammals are covered with hair.

    • Endothermic:Maintaining a constant body temperature through metabolism.

    • Four-chambered heart:Mammals have four-chambered hearts to ensure efficient oxygen delivery.

    • viviparous:Most mammals reproduce by giving birth to live young, but some species, such as monotremes (e.g. the platypus), lay eggs.

  • Habitat:Almost all habitats on Earth, including land, ocean, fresh water, polar regions, etc.

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Mammal classification table

Mammals are numerous and can be subdivided based on different biological characteristics. Mammals are roughly divided into three subclasses:

  1. Monotremata: Oviparous mammals.

  2. Marsupialia: Kangaroos, koalas, etc., whose young continue to develop in a pouch outside the mother's body.

  3. Eutheria: Viviparous mammals, the most abundant species, including humans, lions, whales, etc.

The following is a detailed classification table of mammals, including all orders, families, genera and typical animals:

sortOrderFamilyGenusExamples
MonotremataMonotremataOrnithorhynchidaeOrnithorhynchusPlatypus, Echidna


TachyglossidaeEchidnaEchidna
MarsupialiaMarsupialiaMacropodidaeMacropusKangaroos, wombats, possums


PhascolarctidaePhascolarctoskoala


DasyuridaeDasyurusBandicoot, Tasmanian devil
EutheriaCarnivoraCanidaeCanisWolf, dog, fox


FelidaeFelisHouse cat, lion, tiger


UrsidaeUrsusBlack bear, brown bear, polar bear

PerissodactylaEquidaeEquusHorse, donkey, zebra


RhinocerotidaeRhinocerosWhite rhino, black rhino


TapiridaeTapirusTapirus

ArtiodactylaBovidaeBosCattle, antelopes, sheep


CervidaeCervusDeer, reindeer, sika deer


SuidaeSusWild boar, domestic pig

CetaceaBalaenidaeMegapteraHumpback whale, blue whale


DelphinidaeDelphinusDolphins, killer whales

PrimatesCercopithecidaePongoOrangutans, gibbons, monkeys


HominidaeHomoHumans, chimpanzees, orangutans

RodentiaSciuridaeSciurusSquirrels, Ground Squirrels


CastoridaeCastorbeaver


MuridaeMusHouse mouse, vole

ChiropteraVespertilionidaeMyotisSmall bat, big bat

LagomorphaLeporidaeOryctolagusRabbit, hare

Characteristics and Adaptations of Mammals

Mammals are one of the most diverse groups in the biological world. Here are the main characteristics of mammals and how they adapt:


1. Breastfeeding

A notable feature of mammals is that mothers secrete milk through their mammary glands to feed their offspring. This allows mammal cubs to receive adequate nutritional support after birth, increasing their survival rate.


2. Body hair

Almost all mammals have body hair, which not only helps to keep warm, but also plays a camouflage or display function in some species. For example, the white hair of polar bears helps them camouflage in the snow and reduce the risk of being discovered by prey.


3. Homeothermy

Mammals maintain a stable body temperature through metabolism, which allows mammals to maintain a suitable temperature regardless of changes in the outside temperature. This feature allows mammals to survive in a variety of environments, including extreme environments such as polar regions and deserts.


4. Viviparity

Most mammals reproduce by giving birth to live young, which allows the embryo to receive more stable nutritional support in the mother's body and be more viable after birth. Some species, such as kangaroos and koalas, adopt marsupial parenting.


5. Diet

Mammals have a variety of diets, from herbivorous to carnivorous and omnivorous. Some species (such as bats) have even evolved to suck blood. Different diets allow mammals to find living space in a variety of ecological environments.


Summary: Mammals are the most advanced animals with the most perfect physiological functions. There are more than 4,000 existing mammals. Almost all mammals are warm-blooded. Feeding their offspring with breast milk is one of their most notable characteristics. Mammals include nearly 30 orders, including Monotremes, Carnivores, Primates, Perissodactyla, and Artiodactyla.

Carnivora Primates Rodents Chiroptera Shrews Ungulata Cetacea Lagomorpha Pholidota Proboscidea Monotremata
Kobus vardonii

Kobus vardonii

Puku Waterbuck, Wadsworth's Koel

Features:Most of the fur is golden yellow, with a fuzzy white ring around each eye.

Kobus vardonii (scientific name: Puku) has two subspecies.Territory is established by male Kobus vardonii. Territory size depends on the number of territorial males in the area and the availability of suitable habitat resources. Single males form their own groups, and females tend to be seen in smal...

Kobus megaceros

Kobus megaceros

Nile waterbuck, Nile lechwe, Nile short-nosed lechwe, Nile lechwe, Nile blackbuck, Bighorn lechwe

Features:Mature males have a white "saddle" pattern on their shoulders and white markings on their face.

Nile Waterbuck (scientific name: Kobus megaceros) is also known as Nile Lechwe in English. There is no subspecies.Nile Waterbuck is a crepuscular animal, a social animal that lives in groups but has a sense of territory. It forms groups of 50-500 individuals. In a herd, three social classes are form...

Kobus leche

Kobus leche

Kobus leche

Features:The body color is mainly chestnut, with white belly, throat, mouth and outer ring of eyes.

Lechwe (scientific name: Kobus leche) is called Southern Lechwe in English, Cobe Lechwe, Lechwe in French, Cobo de Lechwe in Spanish, Rooi-lechwe in Afrikaans, and Moorantilope in German. There are 5 subspecies.Lechwes form loose mixed groups and single-sex groups of 400 or up to 1,000 individuals....

Kobus kob

Kobus kob

Kobus kob

Features:White circles around the eyes and black lines on the legs

Kobus kob (Kob in English, Grasantilope in German, Cobe de Buffon in French) has 8 subspecies.Kobus kob may migrate long distances and graze along rivers during migration. One group in southeastern Sudan traveled 150-200 km during the dry season. During these migrations, populations may reach great...

Kobus ellipsiprymnus

Kobus ellipsiprymnus

Kobus ellipsiprymnus

Features:The fur is reddish brown, darkening with age, and the horns are long, ridged, spiral-shaped, and curved backwards.

Waterbuck (scientific name: Kobus ellipsiprymnus) is called Waterbuck in English, Cobe onctueux in French, Afrikaans in Afrikaans, and Wasserbock in German. There are 13 subspecies.Waterbuck is an animal active during the day. There are generally about 30 heads in a family. After giving birth to you...

Rupicapra pyrenaica

Rupicapra pyrenaica

Rupicapra pyrenaica

Features:The throat, neck, shoulders and flanks have white markings, and both sexes have elongated horns.

Pyrenean Chamois (scientific name: Rupicapra pyrenaica) English Southern Chamois, French Isard, Spanish Rebeco meridional, Italian Camoscio meridionale, there are 3 subspecies. Pyrenean antelopes usually live in groups with their mothers until they are 2-3 years old. They l...

Rupicapra rupicapra

Rupicapra rupicapra

Rupicapra rupicapra

Features:There is a distinct black stripe under the eye and a black ridge down the back.

Rupicapra rupicapra (scientific name: Rupicapra rupicapra) English Northern Chamois, Alpine Chamois, Anatolian Chamois, Asia Minor Chamois, Balkan Chamois, Carpathian Chamois, Caucasus Chamois, Chamois, Tatra Chamois, Turkish Chamois, French Chamois, Spanish Gamuza, Gamuza Septentrional, Rebeco sept...

Ovis vignei

Ovis vignei

Ovis vignei

Features:Has black and white saddle patches with a distinct white patch on the rump

Ovis vignei (scientific name: Ovis vignei) is also known as Urial in English. There are 5 subspecies.Ovis vignei is a gregarious sheep, and the group size can be as high as hundreds of individuals. In Iran's "Golestan" National Park, there are herds of more than 4,000, but the average...

Ovis nivicola

Ovis nivicola

Ovis nivicola

Features:Gray-brown fur with a small patch of lighter fur on the rump

Snow Mountain Sheep (scientific name: Ovis nivicola) English Snow Sheep, Russia Chubuk, Snezhnyi Baran, there are 4 subspecies.Snow Mountain Sheep usually do not migrate, but will make seasonal short-distance movements. Large groups are often segregated by sex, with older males forming small groups...

Ovis gmelini

Ovis gmelini

Mouflon

Features:The coat becomes thick and dense in winter and is light brown with some light grey on the back.

Ovis gmelini, English Mouflon, Asiatic Mouflon, French Mouflón, Spanish Muflón, Russian Муфлон, has 3-5 native wild subspecies: the nominate subspecies (O.g. gmelini) and two subspecies limited to Iran: Isfahan subspecies (O.g. isphahanica) and Laristan subspecies (O. g. laristanica). Someti...

Ovis dalli

Ovis dalli

Ovis dalli, Thinhorn Sheep,Dall's Sheep,Stone’s sheep,Muflón de Dall

Features:It is the only slender-horned goat in the genus Argali.

Dall's argali (scientific name: Ovis dalli) English Thinhorn Sheep, Dall's Sheep, Stone's sheep, Spanish Muflón de Dall, there are 2 subspecies.Dall's argali has a complete social system. Ewes live with other ewes, lambs, yearlings and immature rams. Lambs mature early and actively...

Ovis canadensis

Ovis canadensis

Ovis canadensis),Bighorn Sheep,Mountain Sheep,Mouflon D'Amérique,Mouflon Du Canada,Mouflon Pachycère, Borrego Cimarrón,Carnero Del Canadá,Carnero Salvaje

Features:The Rocky Mountain subspecies is the state animal of Alberta, Canada, and is also the state animal of Colorado.

Canadian Bighorn Sheep (scientific name: Ovis canadensis) is called Bighorn Sheep, Mountain Sheep in English, Mouflon D'Amérique, Mouflon Du Canada, Mouflon Pachycère in French, Borrego Cimarrón, Carnero Del Canadá, Carnero Salvaje in Spanish, and has 8 subspecies.Canadian bighorn sheep are...

Oreamnos americanus

Oreamnos americanus

Oreamnos americanus,Mountain Goat,Rocky Mountain Goat

Features:Both males and females have short black horns, whiskers under their jaws, and are covered with a thick layer of long white hair.

Snow sheep (scientific name: Oreamnos americanus) is also known as Mountain Goat and Rocky Mountain Goat. There is no subspecies.The degree of sociality of snow sheep varies throughout the year. They tend to form large herds in the winter and concentrate on salt licks in the spring, but they form sm...

Capricornis sumatraensis

Capricornis sumatraensis

Sumatran serow, Ming mane sheep, mountain donkey, rock donkey, four-legged beast, Pegasus, shepherd

Features:It is similar in shape to a goat or antelope and is named for the gray-white mane on the back of its neck.

Capricornis sumatraensis (English: Mainland Serow, Serow, Spanish: Serau de Sumatra, German: Südlicher Serau), has three subspecies, namely Sumatran Serow (nominal subspecies), Chinese Serow and Himalayan Serow. In ancient times, it was called "Heavenly Horse". According to the Records of...

Capricornis crispus

Capricornis crispus

Capricornis crispus,Japanese Serow

Features:One of Japan's official national treasures

Japanese Serow (scientific name: Capricornis crispus) is also known as Japanese Serow, and has no subspecies. As one of Japan's official national treasures, the Japanese Serow has caused trouble for taxonomists due to its unique characteristics. All species of the genus Serow were once grouped t...

Nilgiritragus hylocrius

Nilgiritragus hylocrius

Nilgiritragus hylocrius,Nilgiri Tahr

Features:Both sexes are beardless and have a silver "saddle" on their backs and white patches on their front legs.

The Nilgiri Tahr sheep (scientific name: Nilgiritragus hylocrius) has a foreign name of Nilgiri Tahr and has no subspecies.Nilgiri Tahr sheep are diurnal but most active in the early morning and evening. At noon, the sheep often retreat to the shade of the cliffs. These cliffs also serve as refuge w...

Arabitragus jayakari

Arabitragus jayakari

Arabitragus jayakari, Arabian Tahr,Wa’al Al ‘arabi

Features:It is the smallest species of the Tahr.

Arabian Tahr (scientific name: Arabitragus jayakari) English: Arabian Tahr, Arabic: Wa’al Al ‘arabi, no subspecies. Arabian Tahr males mark their territories by scraping their hooves and urinating on the ground. The average territory covers an area of 0.3 square kilometer...

Capra walie

Capra walie

Capra walie

Features:Both sexes have horns, and the front surface of the male horns has very obvious ridges.

The Walia Ibex (Capra walie) has no subspecies. Walia Ibex are active or feeding only in the early morning and late evening. They usually become lethargic around midday and tend to hide under dense bushes, away from the strong midday sun and any nearby predators.Unlike most species of the genus Capr...

Capra pyrenaica

Capra pyrenaica

Iberian ibex, Iberian wild goat, Spanish goat, Iberian wild goat, Alpine wild goat

Features:The male's horns are farther apart than those of other species.

Spanish ibex (scientific name: Capra pyrenaica) is called Iberian Wild Goat, Iberian Ibex in English, Bouquetin Ibérique in French, Cabra Montesa, Cabra Montés in Spanish, Iberiensteinbock, Spanischer Steinbock in German, and Cabra-montês in Portuguese. There are 4 subspecies.Spanish ibexes exhib...

Capra nubiana

Capra nubiana

Capra nubiana

Features:There are huge and majestic horns on the head, the longest record is 147.3 cm

Nubian ibex (scientific name: Capra nubiana) English Nubian Ibex, Spanish Íbice Núbico, Arabic Wa'al, German Nubischer Steinbock, Syrischer Steinbock, no subspecies. Nubian ibex was first described as a subspecies of ibex by F. Cuvier in 1825. Synonyms of the species include Capra arabica, Cap...

Capra ibex

Capra ibex

Ibex, Alpine Ibex, Capra Ibex, Alpine Ibex

Features:They use their horns to protect themselves from predators.

Ibex (scientific name: Capra ibex) English Alpine ibex, French Bouquetin des Alpes, Spanish Íbice de los Alpes, German Alpensteinbock, Italian Stambecco alpino, no subspecies.Ibex are herbivores and feed on grass, moss, flowers, leaves and twigs. If leaves and twigs are beyond their reach, ibexes w...