Mammal

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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 — Merriam-Webster See also OneLook

Encyclopedia

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. — Wikipedia

Mammal (Encyclopædia Britannica)

Mammals (One Zoom)
Mammalia Linnaeus, 1758 (Catalogue of Life)
Mammal (WolframAlpha)

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Adventures

Explore related posts on Cosma …

Fat Bear Award? - I just read this fun story on CNN! Fat Bear Week 2025 is the Distraction Everybody Needs (Lilit Marcus, CNN) I couldn’t help but click on it because I was curious, and I did need some distraction. So, there is a “Fat Bear Award” and it is pretty well known. It even has a Wikipedia … Continue reading Fat Bear Award?
Goat Yoga? - Feeling a little stressed out and need a quick relaxation break? How about a bit of goat yoga? Wait, Goat Yoga? If you haven’t heard of it yet, then it might strike you as a bit strange, but it’s become a real craze over the last year or two. Here’s a link to a short … Continue reading Goat Yoga?
Lions, Tigers & Bears… - The advent of360° cameras brought a plethora of 360° videos about animals. Many are conservation oriented like these about lions and tigers. Watch the video below in 360° on YouTube here! METAVRSE (YouTube Channel) METAVRSE (Official Website) Watch the video below in 360° on YouTube here! AirPano VR (YouTube Channel) AirPano VR (Official Website) National … Continue reading Lions, Tigers & Bears…
Nutty Nature News - I’ve been updating the “nature” related pages on this site, so I’ve spent an abnormal amount of time perusing nature related sites for the last few weeks. Along the way I came across more than my fair share of odd nature stories. Many of them were viral, so you may have seen some of them … Continue reading Nutty Nature News
Panda’s Playtime - There’s nothing cuter watching two pandas playing! Here’s a YouTube video from the Atlanta’s Zoo with a serious “aawwwhhhhh” factor. Zoo Atlanta (YouTube Channel) Zoo Atlanta (Official Website) Adorable! However, it turns out there’s something even cuter. That’s pandas playing in the snow. They love it, apparently. Check out this video from Smithsonian’s National Zoo. … Continue reading Panda’s Playtime
Super Sexy, Singing Mice - It’s not often that mice sneak into the news, but they do manage it from time to time. One story that gotten a lot of attention is about how researchers created “super mice” by injecting nanoparticles into their eyes to give them “night vision.” Here are links to the stories about that research. A Shot … Continue reading Super Sexy, Singing Mice
Under the Ice - To paraphrase J.R.R. Tolkien’s famous words in The Lord of the Rings, “It’s a dangerous business, clicking on a link. You glance at a story, and if you don’t watch out, there’s no knowing where you might be swept off to.” This week I innocently clicked on a link to this story from the American … Continue reading Under the Ice
Watchable Whales - A popular tourist activity in Boston is whale watching (Trip Advisor). That is because it’s only a short 25 mile trip out to Stellwagen Bank National Marine Sanctuary (Wikipedia). Stellwagen Bank hosts several different species of large whales, including humpbacks, finbacks, minkes, pilot whales and right whales. If you’ve never seen a whale in person, … Continue reading Watchable Whales

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Inspiration

World’s strangest looking animals – Mammals (ORENYARO, YouTube Video)

Articles about Mammals (Big Think)

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Innovation

Science

Mammalogy is the study of mammals – a class of vertebrates with characteristics such as homeothermic metabolism, fur, four-chambered hearts, and complex nervous systems. Mammalogy has also been known as “mastology,” “theriology,” and “therology.” The major branches of mammalogy include natural history, taxonomy and systematics, anatomy and physiology, ethology, ecology, and management. — Wikipedia

Mammalogy (Encyclopædia Britannica)

The Science of Mammalogy (The American Society of Mammalogists)

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Preservation

Museum

Mammals! (The Brain Scoop, YouTube Playlist)

Kenneth E. Behring Family Hall of Mammals (Smithsonian National Museum of Natural History)

Mammalogy (Museum of Comparative Zoology, Harvard University)

Library

DDC: /599 Mammals (Library Thing)
Subject: Mammals (Library Thing)

Subject: Mammals (Open Library)

LCC: QL 700 Mammals (UPenn Online Books)
Subject: Mammals (UPenn Online Books)

LCC: QL 700 Mammals (Library of Congress)
Subject: Mammals (Library of Congress)

Subject: Mammals (WorldCat)

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Participation

Education

Moving Mammals (OLogy, American Museum of Natural History)
Mammal Locomotion Flip Books (OLogy, American Museum of Natural History)

Introducing the Mammals (Biology4Kids)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources

Community

More News …

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

Scientists changed how zoo lions eat. Their wild...
on October 7, 2026 at 12:46 pm
Giving zoo lions whole carcasses on a feast-and-fast schedule appears to bring out more natural behavior. The lions spent nearly three times longer feeding, engaged in more tearing and manipulating of food, and rested more heavily after meals. Their activity then increased gradually during the fasting period, closely resembling the rhythm seen in wild lions.
Humans may not be as hardwired for violence as we...
on October 7, 2026 at 3:22 am
A study comparing 100 primate species, including humans, suggests that everyday aggression and lethal violence did not evolve as part of the same simple behavioral spectrum. Species that frequently fight or show mild aggression are not necessarily more likely to kill rivals, while extreme acts such as infanticide and lethal attacks appear to follow their own evolutionary patterns.
Bats may have first evolved in Europe 65 million...
on September 30, 2026 at 5:12 am
A huge genomic and fossil study suggests bats first evolved in Europe around 65 to 60 million years ago before spreading across the globe. The findings also indicate that flight and echolocation emerged near the beginning of bat evolution, potentially helping explain how bats became one of the most successful mammal groups on Earth.
Scientists expected these Galápagos sea turtles...
on September 29, 2026 at 3:12 am
Yellow-morph green sea turtles in the Galápagos surprised scientists by staying remarkably close to home instead of making the long journeys typically associated with sea turtles. Satellite tracking showed that none left the marine reserve during the study, revealing just how important the islands’ coastal habitats may be to their survival.
Scientists were wrong about this strange mammal...
on September 28, 2026 at 12:25 pm
A beautifully preserved fossil from Mongolia’s Gobi Desert has solved a mystery that puzzled paleontologists for nearly 40 years. Tamirkhan balcarceli shows that zhelestids were not early relatives of modern placental mammals, despite having teeth that seemed to suggest they were. Instead, the rabbit-like animal belonged to a separate lineage of small Cretaceous mammals.

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

Seals and sea lions get their hearing tested at...
on October 9, 2026 at 9:40 am
Scientists in Australia trained sea lions and seals to respond to a hearing test for research into how the marine mammals are affected by human-made noise.
Hearing tests reveal how sea lions and fur seals...
on October 8, 2026 at 7:40 pm
Curtin University and Taronga Conservation Society Australia researchers have conducted the first hearing tests on Australian sea lions and long-nosed fur seals, revealing what sounds these marine mammals can hear and helping assess how human-made noise could affect them.
Fading control over 'jumping genes' may explain...
on October 8, 2026 at 6:00 pm
Across mammals, larger species typically have longer lifespans, ranging from only a couple of years for mice to almost 200 years for some whales.
Mapping how a single cell becomes an entire mouse
on October 8, 2026 at 6:00 pm
Growing inside each of us is a cellular family tree. Every one of the 37 trillion cells in our body is generated from another cell, going all the way back to a single fertilized egg. Much like we can draw a family tree tracking generations of our ancestors, scientists can also create family trees of cells, showing how they're related to each other.
One ancient swimming mammal fossil and two...
on October 8, 2026 at 5:00 pm
What may have looked like a cross between a platypus and a beaverlike rodent and lived around 120 million years ago? Dongoconodon platycauda, a newly discovered fossil mammal from northeastern China. Beyond its unusual features, such as evidence of webbed paddling feet and a rudderlike tail, this semiaquatic mammal had a surprise waiting for scientists in its jaw: a third generation of teeth.