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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 Pangolins Proboscidea Monotremata
Angora

Angora

Angora,Grass Rabbit

Features:The hair will grow very long and can grow into a hair ball.

Angora rabbit is a world-famous wool-producing rabbit breed, a type of long-haired rabbit. Its hair is dense and long, and it is also called grass mud rabbit on the Internet. According to data from the international ARBA organization, it originated from the Angora Province in Turkey. Another theory...

Monodon monoceros

Monodon monoceros

Monodon monoceros,Narwhal、Unicorn Whale,Narwhal, Lance Whale

Features:There is a long tooth on the head, hence the name

The scientific name of narwhal: Monodon monoceros, foreign names Narwhal, Unicorn Whale, no subspecies.As a protected Arctic species, narwhals are social animals that live mainly in the northern end of the Atlantic Ocean and the Arctic Ocean. A small number of narwhals are also found in the Greenlan...

Nasalis larvatus

Nasalis larvatus

Nasalis larvatus,Tengu Monkey

Features:An unusually large nose and a large, pouch-like stomach

The proboscis monkey (scientific name: Nasalis larvatus) is a unique animal in Kalimantan, Southeast Asia. It is the only species discovered that is not a ruminant but can regurgitate.The social groups of proboscis monkeys change much faster than those of most other primates. Every once in a while,...

Chlamyphorus truncatus

Chlamyphorus truncatus

Chlamyphorus truncatus,Pink Fairy Armadillo,Pink-haired armadillo, sushi armadillo

Mammal LC

Features:It looks like salmon sushi, and its longest claw is about one-sixth of its body length.

The pygmy armadillo (scientific name: Chlamyphorus truncatus) is also known as the Pink Fairy Armadillo. It is the smallest species of the armadillo family.The pygmy armadillo has a high level of digging skills and is said to be able to disappear into a hole in a few seconds. It lives alone and is a...

Proedromys bedfordi

Proedromys bedfordi

Proedromys bedfordi,Arvicolinae

Rodents LC

Features:The body is similar to that of a vole, but slightly larger than an ordinary vole, with smaller ears hidden in the fur. The outer side of the upper incisors has a row of shallow longitudinal grooves.

The species status is stable, but the genus status is somewhat controversial. It was first named as the genus Microtus. Some people believe that it belongs to the genus Microtus (<Microtus>), while others believe that it belongs to the genus Neodon (<Neodon>). Molecular systematic studie...

Lasiopodomys brandtii

Lasiopodomys brandtii

Lasiopodomys brandtii,Sand vole, prairie vole, Blanche vole, Brandt's vole

Rodents LC

Features:The biggest feature is that the front and rear feet are hairy, and the entire sole is covered with dense hair, with only the claws exposed.

The status of Brandt's vole species is stable, but there has been a long-standing debate about which genus it belongs to. Sometimes it is placed in the genus Microtus and sometimes in the genus Phaiomys. Molecular systematics finally confirmed that it is an independent genus, namely the genus La...

Eospalax rothschildi

Eospalax rothschildi

Eospalax rothschildi,Southern zokor, ground mouse

Rodents LC

Features:The hair on the head, back and sides of the body is gray-brown, with a darker gray color and slightly rusty brown at the tips.

The species status of Roth's zokor is stable, but the genus status is controversial. Sometimes the species is placed in the genus <Myospalax>, subgenus <Eospalax>. Some scientists upgrade the subgenus to the genus Eospalax. Now most people agree with the latter opinion. There are 2 s...

Typhlomys nanus

Typhlomys nanus

Typhlomys nanus,Gray blind mouse

Rodents LC

Features:The smallest of the pig-tailed rats.

The pig-tailed rat is a new species published by Cheng Bin et al. of Kunming Institute of Zoology in 2017. It was found in the secondary forest of Abies longibracteata at an altitude of 2000-3000m, with bamboo and rhododendron shrubs under the forest....

Pigtail rat

Pigtail rat

Pigtail rat,Wuyishan tailed rat, pig tailed rat, gray blind rat, blind rat

Rodents LC

Features:It is similar in shape and size to a small house mouse, but has a very long tail. It is also called a "blind mouse" because of its small eyes.

The genus-level and species-level taxonomic units of the Chinese pig-tailed rat are very stable and undisputed. The more controversial is the number of its subspecies. The latest research shows that it contains only 2 subspecies. The other two subspecies (<daloushanensis, chapensis>) have spec...

Sicista concolor

Sicista concolor

Sicista concolor,Small rat, rat, Chinese rat

Rodents LC

Features:The tail is extremely long, about 1.5 times the body length.

The Chinese scissorium belongs to the subfamily Sicidinae of the family Jerboa. There are 13 species in the subfamily worldwide, 4 of which are in China. The Chinese scissorium is the southernmost species in the distribution area and one of the two species that live in the forest. The status of this...

Hylopetes alboniger

Hylopetes alboniger

Hylopetes alboniger, black and white flying squirrel, arrow-tailed black and white flying squirrel

Rodents LC

Features:The back of the body is dark brown, the chest and arms on the ventral side are white, and the fur is all white.

The black-and-white flying squirrel is a small flying squirrel in southern China. The adult is less than 250 mm long. It is active at night, sleeps in the nest during the day, and is active at dusk and dawn. Usually, several live in the same nest. When sleeping, the head is hidden between the front...

Sciurotamias forresti

Sciurotamias forresti

Sciurotamias forresti,White-lined rock squirrel, White-throated rock squirrel, Forster's rock squirrel, Forster's rock squirrel

Rodents LC

Features:There is a narrow white stripe on the side of the body from the shoulder to the buttocks, and a black stripe below the white stripe.

The body size of the side-striped rock squirrel is similar to that of the rock squirrel. It lives in rocky mountainous areas. It lives in camps, but is also good at climbing trees. It is often active during the day, agile, and builds nests in the cracks of rocks. It feeds on nuts and seeds, and can...

Menetes berdmorei

Menetes berdmorei

Menetes berdmorei,Multi-lined squirrel, line squirrel

Rodents LC

Features:There is a light-colored stripe in the middle of the back, and two black stripes and two light yellowish-white longitudinal stripes on each side.

There are six species of animals in the Sciuridae family, three species of squirrels and three species of flying squirrels, namely the red-bellied squirrel, the striped squirrel, the Herschel squirrel, the red flying squirrel, the white-faced flying squirrel and the small flying squirrel.The striped...

Alex Gentry

Alex Gentry

Alex Gentry,Porcupine, Chinese porcupine,Hystricomorpha,

Rodents LC

Features:It is famous for its thorns. It has long and hard thorns on its back and tail, which are important organs for defending against natural enemies.

Porcupine is also called Chinese porcupine. There are 8 species in the genus Porcupine, which are widely distributed in Europe, Asia, and Africa, and only 2 species in China. Chinese porcupine was previously considered a subspecies of Malayan porcupine (<Hystrix brachyura>), and has only recen...

Hystrix brachyura

Hystrix brachyura

Hystrix brachyura

Rodents LC

Features:It has a large body, a brown-black head, and a white longitudinal stripe in the center of the forehead. The spines inside this longitudinal stripe are slender and bristle-like.

The Malayan porcupine is the earliest species named in the genus Porcupine. Previously, there were as many as 11 subspecies or synonyms, and the Chinese porcupine (<Hystrix hodgsoni>) was also once a subspecies. The so-called "Chinese porcupine" is actually originated from Nepal. Yun...

Atherurus macrourus

Atherurus macrourus

Atherurus macrourus,Brush-tailed porcupine, Asian brush-tailed porcupine, Asian brush-tailed porcupine

Rodents LC

Features:Good at swimming and climbing trees.

There are 4 genera and more than 20 species in the porcupine family worldwide. It is a special type of rodent. There are 4 species of the genus Brushtail Porcupine worldwide, and 1 species in China. They mainly live in forests, especially forests near water. According to records, brushtail porcupine...

Rattus flavipectus

Rattus flavipectus

Rattus flavipectus,Yellow-bellied rat, Long-tailed rat

Rodents LC

Features:The tail is equal to or longer than the body length. It is agile and has strong climbing ability.

The yellow-breasted rat belongs to the Murinae subfamily. The scientific name of the yellow-breasted rat is very confusing, and it was once used as <Rattus flavipectus> for a long time. Musser & Carleton (2005) restored <Rattus tanezumi> as the species name of the yellow-breasted rat...

Rattus norvegicus

Rattus norvegicus

Rattus norvegicus,Brown rat, rat, white-tailed rat, dung rat, dung rat

Rodents LC

Features:The body is stout, and the older it gets, the darker the brown color of its back hair. Brown rats are one of the most harmful rats in rural areas and towns. They are numerous and cause great harm.

Brown rats belong to the subfamily Murinae. The species-level classification status is stable, but there are many synonyms and subspecies, and the issue of its merger is controversial. The individuals of this species are smaller in the north and larger in the south. They mainly live in houses and ar...

Rattus nitidus

Rattus nitidus

Rattus nitidus,Gray-breasted rat, water rat

Rodents LC

Features:The Macropodus is a medium-sized rodent with a stout body, large, thin ears, a slender tail, long hind legs, brown fur on the back and grayish-white fur on the belly.

Big-footed rats belong to the Murinae subfamily. The species status is stable, but there are many synonyms, and there are great differences of opinion on the merging of these synonyms. This species mainly inhabits farmland and shrubs, and is generally not in houses. It is similar to the brown rat of...

Rattus losea

Rattus losea

Rattus losea,Rosset, field mouse, garden mouse, yellow mouse, yellow-haired mouse

Rodents LC

Features:It looks very similar to the brown rat, has strong adaptability to the natural environment, and is good at swimming.

The yellow-haired rat belongs to the Murinae subfamily. The type origin of this species is Taiwan, my country. The species-level classification unit is stable, with few synonyms, but there are also disputes. It is mainly distributed in farmland, shrubs, mangroves, and garbage dumps around houses. It...

Rattus andamanensis

Rattus andamanensis

Rattus andamanensis

Rodents LC

Features:The tail is longer than the body, and there is no hair tuft at the tip of the tail.

The black-margined rat belongs to the Murinae subfamily. This species was previously considered a synonym of the black house rat (<Rattus rattus>). It was not until Musser & Caeleton (2005) that it was made an independent species. It is a relatively special species in the genus Rattus, wit...