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mammal : any of a class (Mammalia) of warm-blooded higher vertebrates (such as placentals, marsupials, or monotremes) that nourish their young with milk secreted by mammary glands, have the skin usually more or less covered with hair, and include humans — Webster

OneLook, Free Dictionary, Wiktionary


Mammals are the vertebrates within the class Mammalia, a clade of endothermic amniotes distinguished from reptiles (including birds) by the possession of a neocortex (a region of the brain), hair, three middle ear bones, and mammary glands. Females of all mammal species nurse their young with milk, secreted from the mammary glands.

Mammals include the largest animal on the planet, the blue whale. The basic body type is a terrestrial quadruped, but some mammals are adapted for life at sea, in the air, in trees, underground or on two legs. The largest group of mammals, the placentals, have a placenta, which enables the feeding of the fetus during gestation. Mammals range in size from the 30–40 mm (1.2–1.6 in) bumblebee bat to the 30-meter (98 ft) blue whale. With the exception of the five species of monotreme (egg-laying mammals), all modern mammals give birth to live young. Most mammals, including the six most species-rich orders, belong to the placental group. The largest orders are the rodents, bats and Soricomorpha (shrews and allies). The next three biggest orders, depending on the biological classification scheme used, are the Primates (apes and monkeys), the Cetartiodactyla (whales and even-toed ungulates), and the Carnivora (cats, dogs, seals, and allies). — Wikipedia

Encyclopædia Britannica


Mammals – Mammalogy (Martindale’s Reference Desk)








Mammals (Smithsonian National Museum of Natural History)


WorldCat, Library of Congress, UPenn Online Books, Open Library




Introducing the Mammals (Biology4Kids)


OER Commons: Open Educational Resources



Science Daily,, NPR Archives






More News …

Mammals News -- ScienceDaily Mammals in the news, wild mammals, mammal conservation efforts, and domesticated mammals.

  • Watch dolphins line up to self-medicate skin...
    on May 19, 2022 at 3:53 pm

    If a human comes down with a rash, they might go to the doctor and come away with some ointment to put on it. Indo-Pacific bottlenose dolphins get skin conditions, too, but they come about their medication by queuing up nose-to-tail to rub themselves against corals. Researchers now show that these corals have medicinal properties, suggesting that the dolphins are using the marine invertebrates to medicate skin conditions.

  • Unlocking the secrets of killer whale diets and...
    on May 19, 2022 at 2:38 pm

    Researchers have discovered new clues to understand how killer whales impact their environment.

  • It's a female bonobo's world: Ecologists propose...
    on May 18, 2022 at 3:33 pm

    In the wild, it might seem like male animals run the show. But researchers have laid a new framework to assess power distribution between the sexes, and its application has shown that in some animal species, females rule the roost and their paths to power look very different from that of their male counterparts'.

  • Scientists see signs of traumatic brain injury in...
    on May 17, 2022 at 5:07 pm

    Scientists saw for the first time hallmarks of concussions and other head trauma in the brains of deceased headbutting animals -- muskoxen and bighorn sheep. The results may contradict the commonly-held belief that ramming animals do not suffer brain injuries and support the notion that studies on animals with brains evolutionarily similar to those of humans may help researchers understand and reduce traumatic brain injuries.

  • Scientists provide more than 50K camera trap...
    on May 16, 2022 at 7:02 pm

    Scientists working in the vast Amazon Basin have contributed more than 57,000 camera trap images for a new study. - latest science and technology news stories internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

  • Fishing gear and plastic bag pieces found in the...
    on May 13, 2022 at 5:40 pm

    Biologists conducting an necropsy on a sperm whale that beached itself in the shallow waters of the Gulf of Mexico in the Florida Keys said they found man-made materials in the mammal's stomach that likely contributed to its death.

  • Fighting white-nose syndrome in bats benefits...
    on May 13, 2022 at 5:06 pm

    For years, bats have gotten a bad rap as the creepy creatures lurking in the dark. But for just as long, agricultural producers have known the winged wonder is actually the hero of the story, not the villain.

  • Unusually fast beaked whale has special deep-sea...
    on May 13, 2022 at 5:03 pm

    An international team of biologists has successfully used biologgers to reveal insights into the lifestyle and hunting behavior of the little-known species Sowerby's beaked whale. The team's first results show that these dolphins have a surprisingly different, much faster lifestyle than related species. The research was led by Fleur Visser of the University of Amsterdam (UvA) and the Royal Netherlands Institute for Sea Research (NIOZ). The results were published on 12 May in the Journal of […]

  • Rehabilitated dolphin leaves quarantine at...
    on May 13, 2022 at 8:27 am

    A rescued juvenile bottlenose dolphin, flown from Texas to the Florida Keys-based Dolphin Research Center seven weeks ago, was moved to the facility's primary dolphin lagoon Thursday.

  • What killed the whales? Two found dead off the...
    on May 12, 2022 at 4:39 pm

    Two sperm whales died within seven days of each other in the Florida Keys, according to state and federal officials.


Here are links to pages about closely related subjects.

Knowledge Realm


Sphere Land, Ice, Water (Ocean), Air
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Life Cell, Gene, Tree of Life
Plant Flower, Tree
Invertebrate Cuttlefish, Octopus, Ant, Bee, Butterfly, Spider, Lobster
Vertebrate Fish, Seahorse, Ray, Shark, Frog, Turtle, Tortoise, Dinosaur
Bird, Ostrich, Owl, Crow, Parrot
Mammal Bat, Rabbit, Giraffe, Camel, Horse, Elephant, Mammoth
Whale, Dolphin, Walrus, Seal, Polar Bear, Bear, Cat, Tiger, Lion, Dog, Wolf
Monkey, Chimpanzee, Human


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.