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Mammals (class Mammalia) are a class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain.

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The Mammals

2009 is going to be the busiest year yet for The Mammals. ... Do You Enjoy Reading The Mammals Blog? if so click here and never miss a post! ...themammals.blogspot.com/

Mammals — Blogs, Pictures, and more on WordPress

Blog. Story. Advanced. Blogs about: Mammals. Featured Blog. Goat with wooden posts ... of the most commonly seen wild mammal in Awash National Park is the ...en.wordpress.com/tag/mammals/

Mammals | QUEST Community Science Blog - KQED

As mammals are my greatest love in natural history, I was in awe of the great ... They hunt small marine mammals and migrate a great deal more, going where ...www.kqed.org/quest/blog/tag/mammals/

Scientific American: Mammals

Find the latest Mammals articles, news, and information from the archaeology & paleontology ... Blogs & Opinions in Mammals. View All. 60-Second Science Blog ...www.sciam.com/topic.cfm?id=mammals

Marine Mammals — Blogs, Pictures, and more on WordPress

MARINE MAMMALS: Navy attracts criticism for proposing to use warmer water ... 1 week ago: Blog for February 6, 2009 ... Close Encounters With Marine Mammals ...en.wordpress.com/tag/marine-mammals/

Wikipedia About Mammals

Mammals (class Mammalia) are a class of vertebrate animals characterized by the presence of sweat glands, including sweat glands modified for milk production, hair, three middle ear bones used in hearing, and a neocortex region in the brain.

All mammals (except for the five species of monotremes) give birth to live young instead of laying eggs. 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 Bumblebee Bat to the Blue Whale, distributed in about 1,200 genera, 153 families, and 29 orders, though this varies by classification scheme.

Most mammals belong to the placental group. The four largest orders within the placental mammals are Rodentia (mice, rats, and other small, gnawing mammals), Chiroptera (bats), Carnivora (dogs, cats, bears, and other mammals that primarily eat meat), and Cetartiodactyla (including numerous herbivore species, such as deer, sheep, goats, and buffalos, plus whales). The human species is also a placental mammal, a member of the order Primates.

Phylogenetically, Mammalia is defined as all descendants of the most recent common ancestor of monotremes (e.g., echidnas and platypuses) and therein mammals (marsupials and placentals). 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. These "mammals" are now usually placed in the unranked clade Mammaliaformes.

The mammalian line of descent diverged from the sauropsid line at the end of the Carboniferous period. The sauropsids 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.

Distinguishing features

Living mammal species can be identified by the presence of sweat glands, including those that are specialized to produce milk.

However, other features are required when classifying fossils, since soft tissue glands and some other features are not visible in fossils. Paleontologists use a distinguishing feature that is shared by all living mammals (including monotremes), but is not present in any of the early Triassic synapsids: mammals use two bones for hearing that were used for eating by their ancestors. The earliest synapsids had a jaw joint composed of the articular (a small bone at the back of the lower jaw) and the quadrate (a small bone at the back of the upper jaw). Most reptiles and non-mammalian synapsids use this system including lizards, crocodilians, dinosaurs (and their descendants the birds), and therapsids (mammal-like "reptiles"). Mammals have a different jaw joint, however, composed only of the dentary (the lower jaw bone which carries the teeth) and the squamosal (another small skull bone). In mammals the quadrate and articular bones have become the incus and malleus bones in the middle ear. Note: "non-mammalian synapsids" above implies that mammals are a sub-group of synapsids, and that is exactly what cladistics says they are.

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Mammals

Australia is well known for its unique mammals. ... Australian Museum Mammals. Jump directly to: page contents, mammals site section links, overall museum site ...www.amonline.net.au/mammals

Hall of Mammals

Extensive taxonomy from the University of California Museum of Paleontology.www.ucmp.berkeley.edu/mammal/mammal.html

Homework Help - Yahoo! Kids

HOME. ANIMALS. AMPHIBIANS. BIRDS. FISH. INSECTS. MAMMALS. REPTILES. ANIMALS ON THE WEB. ASK EARL ... ancient egypt animals cats dictionary dinosaurs dogs ...kids.yahoo.com/learn

mammals on Yahoo! Kids Animals

Mammals live on land, at sea, in the air, and under the ground. category ... All mammals, from bats to whales, share a number of important traits that make ...kids.yahoo.com/animals/mammals

Mammals

A sampling of mammals. ... Unlike other animals, mammals have body hair, have 3 middle ear bones (the ... Monotremes are primitive, egg-laying mammals. ...www.enchantedlearning.com/subjects/mammals/Groups.shtml

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News about Mammals

Sea level rises help explain puzzling biological divide

New KeralaWashington, March 9 : Ecologists have come up with a new explanation for an apparently abrupt switch in the kinds of mammals found along the Malay Peninsula in southeast Asia - from mainland species to island species - in the absence of any geographical barrier.http://www.newkerala.com/nkfullnews-1-510.html

Unusual Reproductive Life Of The Naked Mole-Rat

Science DailyNaked mole-rats are very ugly, but also very interesting mammals. Now scientists want to find out whether the males influence the distribution of male and female progeny. http://www.sciencedaily.com/releases/2009/02/090224133328.ht...

Outdoors by the numbers ... 467 species

Pittsburgh Post-Gazette467 species of birds and mammals overseen by the Pennsylvania Game Commission, the state agency tasked with wildlife management.http://www.post-gazette.com/pg/09067/953701-140.stm?cmpid=li...

Big-hearted Fish Reveals Genetics Of Cardiovascular Condition

Science DailyResearchers have found that a human vascular condition called cerebral cavernous malformation is caused by leaky junctions between cells in the lining of blood vessels. By combining studies with zebrafish and mice, they found that the aberrant junctions are the result of mutated or missing proteins in a novel biochemical process, the so-called "Heart-of-glass" CCM pathway. http://www.sciencedaily.com/releases/2009/02/090225132534.ht...

White-nose Syndrome Death In Bats: First Prevention Proposed By Ecologists

Science DailyWhite-nose syndrome is a poorly understood condition that, in the two years since its discovery, has spread to at least seven Northeastern states and killed as many as half a million bats. Now researchers have suggested the first step toward a measure that may help save the affected bats: providing localized heat sources to the hibernating animals. http://www.sciencedaily.com/releases/2009/03/090305102709.ht...

News about Mammals

Scientists: 1 in 4 mammals faces extinction

Seattle TimesConservationists have taken the first detailed look at the world's mammals in more than a decade, and the news isn't good. "Our results paint a bleak picture of the global status of mammals worldwide," the team led by Jan Schipper of the ... http://seattletimes.nwsource.com/html/businesstechnology/200...

1 in 4 mammals face extinction risk

SalonAt least 25% of the world's mammal species are at risk of extinction, according to the first assessment of their status for a decade. The Red List of Threatened Species says populations of more than half of mammalian species are falling, with Asian ... http://www.salon.com/5things/2008/10/06/_in_mammals_face_ext...

Large number of Kerala animals, plants in Red List

HinduFrom Myristica malabarica , a tree found in swamp forests, to birds such as painted stork and black-headed ibis and mammals such as Malabar civet and Nilgiri tahr, a large number of plants and animals endemic to Kerala are there in the latest Red List ... http://www.hindu.com/2008/10/13/stories/2008101357040100.htm

ENVIRONMENT: Global warming sending tropical species uphill

Daily Times ... report indicates that the impact of global climate change on some tropical rainforest and mountain species could be significant.” In another article, Science reports this week on a similar uphill trek by squirrels, mice and other small mammals in ... http://www.dailytimes.com.pk/default.asp?page=2008\10\13\sto...

Researchers document world's mammals in crisis

HULIQ.comWriting in the October 10 issue of Science, ("The Status of the World's Land and Marine Mammals: Diversity, Threat, and Knowledge") and unveiling a "Red List" of endangered mammal species (at the International Union for Conservation of Nature World ... http://www.huliq.com/11/70005/researchers-document-worlds-ma...

Search results for Mammals

Portal:Mammals - Wikipedia, the free encyclopedia

Culture  · Geography  · Health  · History  · Mathematics  · Natural sciences  · Philosophy  · Religion  · Society  · Technologyhttp://en.wikipedia.org/wiki/Portal:Mammals

Mammals

Australia is well known for its unique mammals. It is one of the few places in the world where representatives from all three major groups of mammals can be found. Of the 358 or so ... http://www.amonline.net.au/mammals/

Mammal Pictures, Photos, Facts, Information, Profiles, Sounds ...

Humans are mammals. The word mammal comes from the Latin mamma, meaning breast, because female mammals produce milk to nurse their babies. Nearly all mammals give birth to live ... http://animals.nationalgeographic.com/animals/mammals.html

mammals on Yahoo! Kids Animals

Mammals live on land, at sea, in the air, and under the ground. category ... What Is a Mammal? Mammals live on land, at sea, in the air, and under the ground.http://kids.yahoo.com/animals/mammals

ZOOM MAMMALS - EnchantedLearning.com

Explore mammals, learn about their anatomy and behavior, study fossils and the evolution of mammals, print out classroom activities, find mammal links, and more.http://www.enchantedlearning.com/subjects/mammals/
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Endangered Sea Mammals in Australia

Endangered Sea Mammals in AustraliaA new exhibit of the endangered sea mammal, the Dugong is set to officially open in Sydney on SaturdayFlash - Video

BRAZIL: Skeleton of rare prehistori...

BRAZIL: Skeleton of rare prehistoric mammal assembled in BrazilRio de Janeiro scientists have assembled the fossils of a mammal that lived about 60-million years ago at the beginning of the Cenozoic Era known as Carodnia vieirai. Scientists...MPEG 4 - Video

Ultimate Animal Moms - Mammals

Ultimate Animal Moms - MammalsWatch more at animal.discovery.com Find out more about baby mammals and what makes them special.Flash - Video

Mammals in extinction crisis

Mammals in extinction crisisAn international conservation group says a quarter of the world's mammals face extinction. The International Union for Conservation of Nature says hunting and habitat destruction...Flash - Video

Fossil Discovery Helps Link Fish to...

Fossil Discovery Helps Link Fish to MammalsThe discovery of fossils off the Canadian Arctic might be the missing link between fish and mammals.Video - Video

Answers for Mammals

Limmammals???LimSearch mammals on google or yahoo...Matthew SHow were mammals able to reproduce; after the comet hit earth, with out a period of light?Matthew S"It has been estimated that after the collision there was so much dust in the atmosphere that the entire planet was completely dark for 1-3 months. The lack of sunlight would have caused the extinctio...WalterWhat percentage of mammals give birth to their offspring head first?Waltermost mammal give birth head first (yes giraffes are mammals, they also are not echidnas (another species of monotreme), although there are other species which give birth to live young and are not mamm...EricI really want to work with marine mammals any careers?Erickraftwhat is the difference in the thoracic cavity in mammals and in reptiles?kraftThere is no diaphragm in reptiles. Their cavities are all together without any separation.
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