What are mammals?

Answer 1

Mammals are a class of animals belonging to the Phylum Chordata and Subphylum Vertebrata. They are defined by certain characteristics which all mammals share, including: glands that produce milk, hair, three bones in the middle ear, and a neocortex in the brain.

Most mammals are born live, but there are exceptions. Monotremes, including the echidna and the platypus, lay eggs. Most other mammals give birth to live young mature enough to live outside the womb (called placental mammals). Some are born under developed and live for a while in a special pouch until mature enough to enter the world (called marsupials).

There may be some confusion about mammals which do not appear to have hair, such as porpoises. ALL mammals do have hair, at least at some point in their lives. For some it is just a few whiskers or ear hair which may even fall out by the time the animal reaches maturity. A mammal is a animal that is warmblooded vertebrate ( which means a animal with a backbone) It must have at least a little bit of fur (hair) on its body. Also a mammal's baby must be born alive and must drink it's mother's milk.
The official definition for the word mammal is "a warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, the secretion of milk by females for the nourishment of the young, and the birth of live young."

Mammals are warm blooded. They also have hair or fur. They all almost give live birth but a couple of them lay eggs.

A mammal is a warm blooded animal who does not lay eggs and gives milk to their young
A mammal is a warm-blooded animal that are different from reptiles and birds in several ways. Mammals have hair, mammary glands, middle ear bones, and a neocortex (a region of the brain).
what kind of mammals? mammals likw this

Mammals (formally Mammalia) are a class of vertebrate animals whose name is derived from their distinctive feature, mammary glands, with which they feed their young. They are also characterized by the possession of sweat glands, hair, three middle ear bones used in hearing, and a neocortex region in the brain. Except for the three species of monotremes (which lay eggs), all mammals give birth to live young. Most mammals also possess specialized teeth, and the largest group of mammals, the placentals, use a placenta during gestation. The mammalian brain regulates endothermic and circulatory systems, including a four-chambered heart. There are approximately 5,400 species of mammals, ranging in size from the 30-40-millimetre (1.2-1.6 in) Bumblebee Bat to the 33-metre (110 ft) Blue Whale, distributed in about 1,200 genera, 153 families, and 29 orders,[1] though this varies by classification scheme. The mammals are divided into two subclasses, the prototheria, which includes the egg-laying monotremes, and the theria, which includes the live-bearing marsupials and placentals. Most mammals, including the six largest orders, belong to the placental group. The three largest orders, in descending order, are Rodentia (mice, rats, and other small, gnawing mammals), Chiroptera (bats), and Soricomorpha (shrews, moles and solenodons). The next three largest orders include the Carnivora (dogs, cats, weasels, bears, seals, and their relatives), the Cetartiodactyla (including the even-toed hoofed mammals and the whales) and the Primates to which the human species belongs. The relative size of these latter three orders differs according to the classification scheme and definitions used by various authors. Phylogenetically, Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therian mammals (marsupials and placentals).[2] This means that some extinct groups of "mammals" are not members of the crown group Mammalia, even though most of them have all the characteristics that traditionally would have classified them as mammals.[3] These "mammals" are now usually placed in the unranked clade Mammaliaformes. The mammalian line of descent diverged from the reptile line at the end of the Carboniferous period. The majority of reptiles would evolve into modern-day reptiles and birds, while the synapsid branch led to mammals. The first true mammals appeared in the Jurassic period. Modern mammalian orders appeared in the Palaeocene and Eocene epochs of the Palaeogene period.
Lion Tiger People Sea Lion
A mammal is an animal that carries a baby in its pouch

Answer 2

a lot of animals are mammals even you are but there are lots of sea creatures like dolphins and whales and there are land mammals like lions and dogs and there are still lots more mammals in the world.
mamals are animals with fur, and they are the only animals that have a sense of humor. They also breath air, so fish, not a mamal because they take the oxygen from the water and breath that. But whales, dolphines, seals, walruses, and stuff like that are in fact mamals

Answer 3

Almost all mammals give birth to live young/are viviparous. Mammals have hair, flaps on the outside of the ears/pinnae, jaws, four limbs, differentiated teeth (molars, premolars, canines and incisors), lungs and red blood cells without nuclei. All mammals suckle their young, feeding them on nutritious, proteiniferous and antibody-filled milk.

There are about 5000 species of mammals. Monotremes are the egg-laying exceptions, but still feed their young on milk. Marsupials give birth to underdeveloped live young which crawl into a pouch and feed on milk there until better developed. All other mammals possess a placenta which nurtures the embryo and then foetus until birth at a well-developed stage.

Mammal taxonomy has been recently revolutionised. Orders include Primates (monkeys, humans, apes, tarsiers, lemurs), Xenarthra (anteaters), Cetartiodactyla (whales, dolphins, deer, pigs, giraffes, hippopotamuses, antelope, cattle), Carnivora (cats, dogs, mongooses, badgers, hyaenas, bears, seals) and Rodentia (rats, mice, capybaras, beavers, porcupines, squirrels) and Chiroptera (bats).

Mammals evolved from mammal-like reptiles which existed in the Permian period and may have burrowed and been nocturnal to escape the ruling animals of those days; the dinosaurs.

Answer 4

mammals are the creatures who give birth to their babies.examples of mammals are :bear,tiger,human beings,lion,whale,etc.

Answer 5

An mammal is an warm blooded animal which feeds milk to its baby. A mammal has fur or hair and does not lay eggs. Examples of mammals:

Human

Cats

Dogs

Answer 6

Mammals are mostly animals that give birth to live young, as opposed to in eggs. They almost all have nipples ,udders or breasts which the babies suckle on when very young.

Answer 7

a mammal has hair and feeds milk to its young its does not lay eggs