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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 Eulipotyphla Ungulata Cetacea Lagoiformes Pholidota Proboscidea Monotremata
Canis rufus

Canis rufus

Canis rufus,Red Wolf,North American red wolf

Features:In winter, the red element in the coat color is dominant

Red wolf (scientific name: Canis rufus), also known as Red Wolf in English, is a canine species that lives in North America and has 4 subspecies.Red wolves communicate with their conspecifics through tactile and auditory signals, body language, pheromones, and vocalizations, all of which help commun...

Canis mesomelas

Canis mesomelas

Canis mesomelas,Black-backed Jackal,Black-backed jackal

Features:It has large, pointed ears, a black back with a silver saddle mark, and a large, bushy tail.

The Black-backed Jackal (scientific name: Canis mesomelas) is a long-legged, medium-sized canine with a fox-like pointed muzzle.The black-backed jackal is a monogamous territorial animal, and its social organization is very similar to that of the golden jackal. It is an animal with highly developed...

Canis latrans

Canis latrans

Canis latrans,Coyote,coyote, prairie wolf, coyote

Features:Not very afraid of humans, good at running fast and long distances

Coyote (scientific name: Canis latrans) is a species of Canidae, a close relative of the gray wolf. Because there are as many as 19 subspecies, the body sizes vary greatly. European explorers first discovered this animal in the southwestern United States.Coyotes used to be active during the day, but...

Canis adustus

Canis adustus

Canis adustus,Side-striped Jackal,side-striped jackal

Features:The sides of the body have white stripes with black edges, and the legs and ears are shorter than other jackals.

Side-striped Jackal (scientific name: Canis adustus) is also known as Side-striped Jackal in English. There are 6 subspecies.Side-striped Jackal is monogamous, with a relatively stable family structure. It regularly marks its territory with scent and resists intruders, and has a strong sense of terr...

Atelocynus microtis

Atelocynus microtis

Atelocynus microtis,Short-eared Dog,short-eared dog, short-eared fox, small-eared dog

Features:It is one of the rarest carnivores in South America.

Short-eared Dog (scientific name: Atelocynus microtis) is also known as Short-eared Dog. They are more agile than most dogs when exercising and are more cat-like than dogs.Given its strong odor, anal gland secretions may be used to communicate information between small-eared dogs. It is a timid and...

Philippine tarsier

Philippine tarsier

Philippine tarsier,Tarsier

Features:It is only the size of an adult's fist, and its eyes are particularly large.

Tarsier (scientific name: Philippine tarsier), also known as tarsier, belongs to the primates, the suborder Simplorhinidae, the order Tarsieridae. There are 4 species in the world. In addition to the pygmy tarsier, there is another species that is also distributed on Sulawesi Island, called the Su I...

Vulpes lagopus

Vulpes lagopus

Vulpes lagopus,Arctic Fox,Blue fox, white fox

Features:Known as the most beautiful fox

Arctic fox (scientific name: Vulpes lagopus) is called Arctic Fox in foreign language. There are 4 subspecies. In addition, Arctic foxes can be divided into two categories according to their fur color. There are also some artificially bred varieties.Arctic foxes can migrate long distances and have s...

Dabashan pika

Dabashan pika

Features:Sickle-like ears

The Dabashan pika belongs to the subgenus Alienauroa. The subgenus Alienauroa was established by Liu Shaoying et al. (2016). It is a very special type of pika with an obvious bat-like tragus in its ears. This genus is mainly distributed in forest areas with lower altitudes. This species is also one...

Ochotona yarlungensis

Ochotona yarlungensis

Ochotona yarlungensis

Features:It looks like a Metaceratops, with a narrow dark grey circle on the lip edge.

The Yarlung Zangbo pika belongs to the subgenus Ochotona and is a new species discovered by Liu Shaoying et al. (2016). Its distribution area is very narrow. It lives in relatively dry river valley shrubs with many gravels. There is almost no ecological research. In terms of phylogeny, it has a clos...

Ochotona thomasi

Ochotona thomasi

Ochotona thomasi,Singing Mouse

Features:Cranial stenosis

The scientific name of the narrow-headed pika is Ochotona thomasi, belonging to the subgenus <Ochotona>. It is a very special species with a small population, a narrow distribution area, few studies, and few specimens, which deserves high attention.The narrow-headed pika has complex burrows an...

Ochotona thibetana

Ochotona thibetana

Ochotona thibetana

Features:The ears are short and round, the tail is very short, and the base of the hair on the back is dark gray.

Tibetan pikas are active day and night, and are agile. They often chase each other for fun, and quickly go into the cave when they encounter an enemy.The cave system of Tibetan pikas is complex, with as many as 5-6 exits: the exits are generally opened at haystacks and tree roots. The cave entrance...

Nubulake Pika

Nubulake Pika

Features:There is a circle of yellow hair on the neck behind the ears.

Nubulak pika belongs to the nominate subgenus (<Ochotona>). It was previously incorporated into the steppe pika (<O. pusilla>), the gray pika (<O. roylei>) and the Tibetan pika (<O. thibetana>). Yu Ning and Zheng Changlin (1992) revised it and listed it as an independent spec...

Ochotona dauurica

Ochotona dauurica

Ochotona dauurica,Rabbit, rabbit, crying rabbit, Mongolian pika, Dahur pika

Features:The body color is lighter, sandy brown, the ears are large and round, and the upper lip is split vertically like a rabbit.

The Daurian pika belongs to the subgenus Ochotona, which was once included in the black-lipped pika (Ochotona curzoniae), but its independent species status was later accepted. There are 3 subspecies and 5 synonyms. Therefore, the classification within the species is rather chaotic. It is a common s...

Ochotona curzoniae

Ochotona curzoniae

Ochotona curzoniae,Plateau pika, singing mouse, stone rabbit, Anona

Features:There is a noticeable black colour around the lips.

The black-lipped pika is also known as the plateau pika, the singing pika, the stone rabbit, and is called "Anona" in Tibetan medicine. It belongs to the subgenus "Ochotona". It is also called the plateau pika, and is a key species in the entire Qinghai-Tibet Plateau meadow ecosy...

Ochotona cansus

Ochotona cansus

Ochotona cansus, Singing Mouse

Features:The front feet have five toes with thick and long claws, while the hind feet have four toes with thin and long claws.

The Intercranial Pika, also known as the Singing Pika, belongs to the subgenus Ochotona. It was previously merged into the Tibetan Pika, but later became independent. There is no dispute about the species. It is the smaller individual in the genus. It is distributed at a higher altitude than the Tib...

Dendroaspis polylepis

Dendroaspis polylepis

Dendroaspis polylepis,Black Mamba

Features:The fastest and most aggressive snake in the world

Black Mamba (scientific name: Dendroaspis polylepis): It is a venomous snake of the family Elapidae and the genus Black Mamba, with 2 subspecies.One of the reasons why the Black Mamba is so famous is that it contains a lot of legendary color. In Africa, many people have heard the legendary stories o...

Desmodus

Desmodus

Desmodus

Features:It is the only mammal that can fly in the sky and feeds on blood.

Vampire bats (scientific name: Desmodus) are a general term for all species of vampire bats in the family Desmodus. There are three species of vampire bats belonging to the family Desmodus and the genus Desmodus. Vampire bats are small in size, have no exposed tail, and their fur is mainly dark brow...

Condylura cristata

Condylura cristata

Condylura cristata,Star-nosed mole

Mammal LC

Features:The tip of the nose has 22 tentacles, which are named after the shape of the glowing stars.

Star-nosed mole (scientific name: Condylura cristata): is a small mole found in eastern North America, eastern Canada and northeastern United States. It is the only member of the star-nosed mole family and the star-nosed mole genus, with no subspecies.Star-nosed moles live in moist lowlands and feed...

Ornithorhynchus anatinus

Ornithorhynchus anatinus

Ornithorhynchus anatinus,Duck Otter

Mammal LC

Features:It has a duck-like beak and feet, and a beaver-like body and tail.

The platypus is one of the most primitive mammals. It is an incompletely evolved mammal with very few species. The platypus is the only animal in the same genus and is also one of the lowest mammals. In the late 18th century, George Shaw received a platypus specimen and thought that the creature was...

Niviventer coxingi

Niviventer coxingi

Niviventer coxingi,Niviventer culturatus,Coxing

Rodents LC

Features:The belly is grayish white, the dorsal surface is yellowish brown, and the tentacles are very long.

The taxonomic status of this species is stable and there is little controversy. It is distributed in tropical evergreen broad-leaved forests, forest edges and shrubs below 2000m above sea level....

Cricetulus triton

Cricetulus triton

Cricetulus triton,Grey hamster

Rodents LC

Features:It has a large body, a short tail, a blunt head, cheek pouches, and short, round ears with narrow white edges.

The status of the giant hamster species is stable, and there are some differences in the genus it belongs to. Some scientists regard it as a species of the genus Cricetulus, and most scientists agree that it belongs to the genus Tscherskia. There are many subspecies differentiations, and there are 5...