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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
Balaenoptera physalus

Balaenoptera physalus

Balaenoptera physalus,Fin Whale,Finback whale, baleen whale, razorback whale, herring whale, fin whale

Cetacea LC

Features:The second largest animal in the world

Fin whales are one of the fastest whales, with a speed of up to 37 kilometers per hour, and a record high of 40 kilometers per hour. They are known as the "greyhound of the deep sea".Fin whales use their baleen to filter food and then swallow it. Their food includes small fish, squid and c...

Balaenoptera omurai

Balaenoptera omurai

Balaenoptera omurai,Omura whale

Cetacea LC

Features:The rarest whale species on Earth

Omura's whale is a medium-sized whale that looks very similar to a fin whale, but is much smaller than a fin whale.Omura's whale was not confirmed and named until 2003. Because the type specimen was stranded on Tsukushima Island in Shimonoseki City, Yamaguchi Prefecture, Japan, it is commonl...

Balaenoptera brydei

Balaenoptera brydei

Balaenoptera brydei,Bryde's whale,Anchovy, Pseudomonas auratus

Cetacea LC

Features:The most distinctive feature is the three parallel longitudinal ridges on the head

Bryde's whale, also known as Bryde's whale in English, has no subspecies and is the only baleen whale that lives in tropical or subtropical areas all year round.Bryde's whale is very similar to Sei whale, the main difference is that Sei whale has a ridge on each side of the central ridge...

Balaenoptera borealis

Balaenoptera borealis

Balaenoptera borealis,Sei whale, baleen whale, northern baleen whale, great baleen whale, cod whale

Cetacea LC

Features:Fast swimmers, possibly the fastest of all whales

Sei whales are called Sei whales in foreign languages and have two subspecies.The body shape of Sei whales is similar to that of fin whales, Bryde's whales and small Bryde's whales, and the shape of their dorsal fins is also similar. The main distinguishing feature is that the sei whale has...

Balaenoptera acutorostrata

Balaenoptera acutorostrata

Balaenoptera acutorostrata,Minke Whale、Common Minke Whale,Minke whale, Sharp-billed whale

Cetacea LC

Features:Mother whales are very attached to their calves, and they seem to protect their calves.

Minke Whale has two subspecies and is a small baleen whale of the genus Mysticetus.Minke Whale has 230 to 273 baleen pieces on each side. According to statistics of 38 individuals, the average is 253 pieces. The length of the entire whisker row is about 60% of the length of the skull. The whisker pl...

Balaenoptera musculus

Balaenoptera musculus

Balaenoptera musculus,Balaena musculus Linnaeus,Blue Whale, Baleine bleue,Ballena Azul,Blauwal, Razorback whale, Sulphur bottom whale, Sibud's whale, Seba's baleen whale, Great blue whale, G

Cetacea LC

Features:The largest animal in the world

The blue whale is called Blue Whale in English. There are 4 subspecies. It is not only the largest whale, but also the largest animal in existence and the largest mammal to date.The species name of the blue whale, musculus, comes from Latin, which means "strong", but can also be translated...

Eschrichtius robustus

Eschrichtius robustus

Eschrichtius robustus,gray whale,Whale killer, shell digger, weak whale

Cetacea LC

Features:The mammal species with the longest migration distance

Gray whale is also known as gray whale in English. Its body circumference is larger than that of baleen whales, but smaller than that of right whales.On the North American side of the Pacific Ocean, gray whales pass through the Bering Strait and the northwest Bering Sea from late May to late October...

Eubalaena japonica

Eubalaena japonica

Eubalaena japonica,North Pacific right whale, black right whale, black right whale

Cetacea LC

Features:The body circumference is thick, and the ratio of body circumference to body length is significantly greater than that of other types of baleen whales.

The North Pacific right whale has no subspecies.For a long time, cetaceans believed that right whales in the northern and southern hemispheres were two species: the northern right whale (Eubalaena glacialis) and the southern right whale (Eubalaena australis). Rice (1998) advocated that the genus Eub...

Lepus yarkandensis

Lepus yarkandensis

Lepus yarkandensis,Southern Xinjiang rabbit, Shache rabbit, hare

Features:It is a unique species in the Tarim Basin and a remnant species of the Tarim paleo-block.

The Tarim rabbit is called Yarkandhare in English and is a typical desert species.After the Himalayas rose, the Kunlun, Altai and Qilian Mountains rose strongly, and after being connected with the Eurasian continental block, the land area increased, blocking the Indian Ocean warm current, and the cl...

Lepus timidus

Lepus timidus

Lepus timidus,Mountain hare,White rabbit, color-changing rabbit, blue rabbit

Features:It is the only wild rabbit in China whose fur turns white in winter.

The snow hare is called Mountain hare in English, and there are 25 subspecies.Snow hares generally act alone except during the estrus period. During the day, it hides in simple caves under bushes, hollows and fallen trees, which are covered with dead branches and leaves and its own shed hair. It com...

Ochotona argentata

Ochotona argentata

Ochotona argentata,Ningxia pika

Features:It is a larger species of Chinese pika.

Helan Mountain Pika, also known as Ningxia Pika, English name Silver Pika, is a species endemic to China.Helan Mountain Pika is active during the day, active frequently at dawn and dusk, and will build typical pika haystacks. It mainly feeds on leaves and stems of Artemisia, Euphorbia and Poaceae pl...

Sciuridae

Sciuridae

Sciuridae,Squirrel,Tree Rat

Rodents LC

Features:A squirrel with a big furry tail that chews pine cones

Squirrels, belonging to the family Sciuridae of the order Rodentia, refer to a large class of rodents with fluffy long hair on their tails. There are about 58 genera and 285 species in existence, distributed throughout all continents except Antarctica (introduced species in Oceania). Contrary to mos...

Castor

Castor

Castor,beaver

Rodents LC

Features:Bit off a tree with a diameter of 40cm within 2 hours

Beaver is called Eurasian Beaver in English, and there are 7 subspecies.Beavers are active at night and rarely leave their holes during the day. They are good at swimming and diving and do not hibernate. Beavers have a unique ability to build dams. Wherever beavers live or have lived, there is a pon...

Capracornis swinhoei

Capracornis swinhoei

Capracornis swinhoei,Taiwan serow,Formosan goat, Formosan wild goat

Features:It is a specialty of Taiwan Island, China

Taiwan serow is called Taiwan serow in English, and has no subspecies. The Taiwan serow is smaller in size and more similar to the goral (Naemorhedus goral) than the mainland's serow (Capricornis sumatraensis), with brown hair, shorter mane than the mainland serow, but more erect, with a light c...

Capricornis rubidus

Capricornis rubidus

Capricornis rubidus,Capricornis sumatraensis Blyth, 1863 ssp. rubidus ,Red Serow,Burmese Red Serow,Arakan Serow , Roter Serau , Saro carmin, saro rouge , Sirao rojo,Serau rojo, serau de Birmania,Red S

Features:Newly recorded mammal species in China

Red Serow, with no subspecies, is a separate species of the genus Serow in the family Bovidae of the order Artiodactylus.The red fur appearance of the Red Serow is easily distinguished from other black, gray or dark brown species of the genus Serow. However, some experts believe that the population...

Capricornis milneedwardsii

Capricornis milneedwardsii

Capricornis milneedwardsii,Chinese Serow,Four-legged beast, Sumatran serow

Features:The prototype of the ancient "Sky Horse"

Chinese Serow, also known as Chinese Serow in English, has two subspecies and is one of the typical animals in the tropical and subtropical regions of southeast Asia.The horns of the Chinese serow look like a deer, but it is not a deer; the hooves look like a cow, but it is not a cow; the head looks...

Ovis polii

Ovis polii

Ovis polii,Ovis poli typica Lydekker,Ovis ammon poli Blyth,Pamir Sheep,Marco Polo Sheep

Features:It has the longest horns of all argali sheep. The longest individual horn ever recorded is 1.9 meters long and weighs 27 kilograms.

Pamir Sheep, also known as Pamir Sheep, was once a subspecies of argali.The Pamir argali subspecies "Ovis ammon polii" was first scientifically described by zoologist "Edward Blyth" in 1841. These argali are also commonly referred to as "Marco Polo argali" or "Pami...

Ovis karelini

Ovis karelini

Ovis karelini

Features:The characteristics of the horns are between those of the Pamir argali and the Altai argali

Tian Shan Argali, once the Tianshan subspecies of Argali.The Tianshan argali is generally considered to be the Tianshan subspecies of the argali (Ovis ammon). The Ungulate Taxonomy co-authored by British scholar Peter Grubb and Australian scholar Colin Groves The 2019 edition of the Convention...

Ovis hodgsoni

Ovis hodgsoni

Ovis hodgsoni,Tibetan argali,Tibetan sheep, Dalai Lama argali, Altun Mountain argali, white-breasted argali, Tibetan argali, big monk argali

Features:The largest of all argali subspecies

Tibetan argali, also known as Tibetan argali in English, is a typical mountain animal and was once a subspecies of argali.The scientific Latin name of the Tibetan argali, one of its synonymous scientific names "Ovis ammon dalai-lamae" (also formerly "Argallo Altun Mountain subspecies&...

Ovis darwini

Ovis darwini

Ovis darwini,Mongolian argali, Argali mongolica

Features:The horns are the shortest of all the Asiatic mouflon

The Gobi argali is named Ovis darwini, and was once a subspecies of argali.The Gobi argali is generally considered to be a Gobi subspecies of the argali (Ovis ammon). It is considered an independent species in the book Ungulate Taxonomy co-authored by British scholar Peter Grubb and Australian schol...

Ovis collium

Ovis collium

Ovis collium,Kasachstan Argali,Ovis ammon collium

Features:Formerly a subspecies of the argali

Kazakh Argali, also known as Kasachstan Argali, was once a species of Argali.Kazakh Argali was once considered a subspecies of Ovis ammon. The 2019 edition of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) considers it an independent species, and China...