A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia (/ m ə ˈ m eɪ l i. ə /). Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones.

Unlike other vertebrates, they are the only animals that produce milk for their young through their mammary glands. Parental care of the young is universal among mammals, sometimes for long periods. Mammals became the dominant land animals after non-bird dinosaurs were eliminated.

Over 70% of mammal species are in the orders Rodentia, Chiroptera, and Eulipotyphla. Mammalia is a class of animal within the phylum Chordata. Mammal classification has been through several iterations since Carl Linnaeus initially defined the class.

There are currently 1,258 genera, 161 families, 27 orders, and around 5,937 recognized living species of mammal. [1] Mammalian taxonomy is in constant flux as many new species are described and recategorized within their respective genera and families.

2023年11月22日 · Mammals represent a diverse and fascinating class of animals, encompassing a wide range of species from tiny shrews to humans to the colossal blue whale. As members of the class Mammalia, they share certain defining characteristics that …

5 天之前 · mammal, (class Mammalia), any member of the group of vertebrate animals in which the young are nourished with milk from special mammary glands of the mother. In addition to these characteristic milk glands, mammals are distinguished by several other unique features.

Over 70% of mammal species are in the orders Rodentia (blue), Chiroptera (red) and Soricomorpha (yellow). Mammalia is a class of animal in the phylum Chordata. What it means to be a mammal has changed many times since Carl Linnaeus first defined the class. No system is accepted by everyone.

2022年10月6日 · There are three different types of mammal birth. Monotremes, marsupial, and placental mammals, discussed further below.

2025年1月7日 · (zoology) Characterized by being warm-blooded, having hair or fur and producing milk with which to feed its young. (paleontology) Characterized by having vertebrae and three bones in the inner ear and one in the jaw.

2024年12月13日 · Mammal Species of the World: a taxonomic and geographic reference. 2rd edition. Smithsonian Institution Press: Washington, D.C. xviii + 1206 pp. ISBN 978-1-56098-217-3 . Reference page .