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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.

  • Nearly a hundred genes have been lost during the...
    on August 10, 2022 at 4:36 pm

    A new study shows that 87 genes have been affected by deletions or short insertions during the course of the mammoth's evolution. The researchers note that their findings have implications for international efforts to resurrect extinct species, including the woolly mammoth.

  • Hibernation slows biological aging in bats
    on August 9, 2022 at 11:49 pm

    A new study identifies one of the secrets to big brown bats' exceptional longevity: hibernation.

  • CT scanner captures entire woolly mammoth tusk
    on August 9, 2022 at 6:12 pm

    Researchers successfully captured CT images of an entire woolly mammoth tusk. Researchers were able to do a full scan of the tusk in its entirety -- or in toto -- using a newer clinical CT scanner. The new technology allows for large-scale imaging without having to do multiple partial scans.

  • More wolves, beavers needed as part of improving...
    on August 9, 2022 at 2:17 pm

    Scientists are proposing management changes on western federal lands that they say would result in more wolves and beavers and would re-establish ecological processes.

  • Sterile mice produce rat sperm
    on August 4, 2022 at 5:06 pm

    Researchers generated rat sperm cells inside sterile mice using a technique called blastocyst complementation. - 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.

  • Study achieves longest continuous tracking of...
    on August 11, 2022 at 6:00 pm

    Insects are the world's smallest flying migrants, but they can maintain perfectly straight flight paths even in unfavorable wind conditions, according to a new study from the Max Planck Institute of Animal Behavior (MPI-AB) and the University of Konstanz. Researchers radio tracked migrating hawkmoths for up to 80 kilometers—the longest distance that any insect has been continuously monitored in the wild. By closely following individuals during migration, the world-first study unlocks a […]

  • How beavers stay wet during UK drought
    on August 11, 2022 at 2:59 pm

    As parts of the U.K. experience one of the worst droughts in a century, a little patch in the southeast of England is babbling with life.

  • Discarded pandemic face masks could harm wildlife...
    on August 11, 2022 at 2:57 pm

    While no longer as prevalent as they once were, the billions of face masks and gloves that were produced during the pandemic are making plastic pollution an ever-greater issue.

  • Whales have altered their development to be able...
    on August 11, 2022 at 2:54 pm

    Researchers found that different groups of whales and dolphins take varying routes as they develop in a delicate balancing act between their evolutionary history and current environment.

  • Surprise discovery shows you may inherit more...
    on August 11, 2022 at 2:38 pm

    What if we could inherit more than our parents' genes? What if we could inherit the ability to turn genes on and off?


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.