Lions
Discover great deals on the many hard to find and one of a kind items available only on ebay!

Mammal

The mammals are the class of vertebrate animals characterized by the presence of mammary glands, which in females produce milk for the nourishment of young; the presence of hair or fur; and which have endothermic or "warm-blooded" bodies. more...

HomeHome
AmphibianAmphibian
ArthropodArthropod
BirdBird
CatCat
DinosaurDinosaur
DogDog
FishFish
MammalMammal
AardvarkAardvark
AnteaterAnteater
AntelopeAntelope
ApeApe
ArmadilloArmadillo
BadgerBadger
BandicootBandicoot
BatBat
BearBear
BeaverBeaver
BelugaBeluga
BisonBison
Black BearBlack Bear
Blue WhaleBlue Whale
BoarBoar
BobcatBobcat
Brown BearBrown Bear
BullBull
BunnyBunny
CamelCamel
CattleCattle
CheetahCheetah
ChimpChimp
ChimpanzeeChimpanzee
ChipmunkChipmunk
CowCow
CoyoteCoyote
DeerDeer
DolphinDolphin
DonkeyDonkey
ElephantElephant
ElkElk
FerretFerret
FoxFox
GiraffeGiraffe
GoatGoat
GooseGoose
GopherGopher
GorillaGorilla
Grizzly BearGrizzly Bear
HareHare
HedgehogHedgehog
HippopotomasHippopotomas
HorseHorse
HumanHuman
Humpback WhaleHumpback Whale
IbexIbex
JaguarJaguar
KangarooKangaroo
Killer WhaleKiller Whale
KoalaKoala
LemmingLemming
LemurLemur
LeopardLeopard
LionLion
LynxLynx
ManateeManatee
MarmotMarmot
MarsupialMarsupial
MeercatMeercat
MinkMink
MoleMole
MongooseMongoose
MonkeyMonkey
MooseMoose
MouseMouse
MuleMule
MuskratMuskrat
OppossumOppossum
OrangutanOrangutan
OrcaOrca
OtterOtter
PangolinPangolin
PigPig
Polar BearPolar Bear
PorcupinePorcupine
PorpoisePorpoise
PossumPossum
Prairie DogPrairie Dog
RabbitRabbit
RacoonRacoon
RatRat
RhinocerosRhinoceros
RodentRodent
SealSeal
SheepSheep
ShrewShrew
SkunkSkunk
SlothSloth
Sperm WhaleSperm Whale
SquirrelSquirrel
SteerSteer
TenrecTenrec
TigerTiger
VoleVole
WalrusWalrus
WeaselWeasel
WhaleWhale
WolfWolf
WolverineWolverine
WombatWombat
Wooly MammothWooly Mammoth
ZebraZebra
MythologicalMythological
ReptileReptile


The brain regulates endothermic and circulatory systems, including a four-chambered heart. Mammals encompass some 5500 species, distributed in about 1200 genera, 152 families and up to 46 orders, though this varies depending on the classification scheme adopted.

Phylogenetically, Mammalia is defined as all of the descendants of the last common ancestor of monotremes (e.g., echidnas) and therian mammals (placentals and marsupials).

Characteristics

While most mammals give birth to live young, there are a few mammals (the monotremes) that lay eggs. Live birth also occurs in a variety of non-mammalian species, such as guppies and hammerhead sharks; thus it is not a distinguishing characteristic of mammals. Although all mammals are endothermic, so are birds and so this is also not a main defining feature.

While monotremes do not have nipples, they do have mammary glands, meaning that they meet all conditions for inclusion in the class Mammalia. It should be noted that the current trend in taxonomy is to emphasize common ancestry; the diagnostic characteristics are useful for identifying this ancestry, but if, for example, a cetacean were found that had no hair at all, it would still be classified as a mammal.

Mammals have three bones in each ear and one (the dentary) on each side of the lower jaw; all other vertebrates with ears have one bone (the stapes) in the ear and at least three on each side of the jaw. A group of therapsids called cynodonts had three bones in the jaw, but the main jaw joint was the dentary and the other bones conducted sound. The extra jaw bones of other vertebrates are thought to be homologous with the malleus and incus of the mammal ear.

All mammalian brains possess a neocortex. This brain region is unique to mammals.

Mammals have integumentary systems made up of three layers: the outermost epidermis, the dermis, and the hypodermis.

The epidermis is typically ten to thirty cells thick, its main function being to provide a waterproof layer. Its outermost cells are constantly lost; its bottommost cells are constantly dividing and pushing upward. The middle layer, the dermis, is fifteen to forty times thicker than the epidermis. The dermis is made up of many components such as bony structures and blood vessels. The hypodermis is made up of adipose tissue. Its job is to store lipids, and to provide cushioning and insulation. The thickness of this layer varies widely from species to species.

Most mammals are terrestrial, but a number are aquatic, including sirenia (manatees and dugongs) and the cetaceans (dolphins and whales). Whales are the largest of all animals. There are semi-aquatic species such as seals which come to land to breed but spend the majority of the time in water.

True flight has evolved only once in mammals, the bats; mammals such as flying squirrels and flying lemurs are actually gliding animals.

No mammals have hair naturally blue or green in colour. Some cetaceans, along with the mandrills appear to have shades of blue skin. Many mammals are indicated as having blue hair or fur, but in all cases, it will be found to be a shade of grey. The two-toed sloth can seem to have green fur, however, this colour is caused by algae growths.

Origins

Mammals belong among the amniotes, and in particular to a group called the synapsids, distinguished by the shape of their skulls, in particular the presence of a single hole where jaw muscles attach, called temporal fenestra. In comparison, dinosaurs, birds, and most reptiles are diapsids, with two temporal fenestrae; and turtles, with no temporal fenestra, are anapsids.

From synapsids came the first mammal precursors, therapsids, and more specifically the eucynodonts, 220 million years ago (mya) during the Triassic period.

Pre-mammalian ears began evolving in the late Permian to early Triassic to their current state, as three tiny bones (incus, malleus, and stapes) inside the skull; accompanied by the transformation of the lower jaw into a single bone. Other animals, including reptiles and pre-mammalian synapsids and therapsids, have several bones in the lower jaw, some of which are used for hearing; and a single ear-bone in the skull, the stapes. This transition is evidence of mammalian evolution from reptilian beginnings: from a single ear bone, and several lower jaw bones (for example the sailback pelycosaur, Dimetrodon) to progressively smaller "hearing jaw bones" (for example the cynodont, Probainognathus), and finally (possibly with Morganucodon, but definitely with Hadrocodium), true mammals with three ear bones in the skull and a single lower jaw bone. Hence pelycosaurs and cynodonts are sometimes called "mammal-like reptiles", though this is strictly incorrect since in modern parlance these two are not reptiles, but rather synapsids.

During the Mesozoic Period mammals diversified into four main groups: multituberculates, monotremes, marsupials, and placentals. Multituberculates went extinct during the Oligocene, about 30 million years ago, but the three other mammal groups are all represented today. Most early mammals remained small and shrew-like throughout the Mesozoic, but rapidly developed into larger more diverse forms following the Cretaceous-Tertiary extinction event 65 mya.

The names "Prototheria", "Metatheria" and "Eutheria" expressed the theory that Placentalia were descendants of Marsupialia, which were in turn descendants of Monotremata, but this theory has been refuted. However, Eutheria and Metatheria are often used in paleontology, especially with regards to mammals of the Mesozoic.

Mammal evolutionary progression is below:

  • Jawless fish: Cambrian period to mid Ordovician periods
  • Bony fish: mid-Ordovician period to late Devonian period
  • Amphibians: late Devonian period to early Carboniferous period
  • Reptiles: late Carboniferous period
  • Pelycosaurs (synapsids, or "mammal-like reptiles"): late Carboniferous period to very early Triassic period
  • Cynodonts: Permian-Triassic
  • Mammals: mid-Triassic period to today

Read more at Wikipedia.org


[List your site here Free!]

1953 2nd Mentor Printing No. M63-How To Know the American Mammals by Sanderson1953 2nd Mentor Printing No. M63-How To Know the American Mammals by Sanderson $13.00 Vintage,Book,Dolphin,R,Mo rris,Mammal,Science,Child, FishVintage,Book,Dolphin,R,Mo rris,Mammal,Science,Child, Fish $7.95
2 South American Jaguar Teeth2 South American Jaguar Teeth $25.03 $29.99
Mammals: A Fully Illustrated, Authoritative and Easy-to-Use Guide (A Golden GuidMammals: A Fully Illustrated, Authoritative and Easy-to-Use Guide (A Golden Guid $3.85 Whales, Dolphins, and Other Marine Mammals by George S. Fichter (English) PaperbWhales, Dolphins, and Other Marine Mammals by George S. Fichter (English) Paperb $7.91
Moose Metal Silver Cigarette Case D1 Elk Deer Herbivore Mammal Forest AnimalMoose Metal Silver Cigarette Case D1 Elk Deer Herbivore Mammal Forest Animal $5.95 Mammals (Navigators)Mammals (Navigators) $5.99 List price: Previous Price $12.99
Field Guide To The Mammals Of Britain & Europe Maurice BurtonField Guide To The Mammals Of Britain & Europe Maurice Burton $6.98 Audubon Soc First Field Guide: MammalsAudubon Soc First Field Guide: Mammals $6.99
Roger Tory Peterson field guide - Mammals of Britain & Europe - Leather EastonRoger Tory Peterson field guide - Mammals of Britain & Europe - Leather Easton $9.00 Home And Habits Of Wild Animals North American Mammals by Karl Patterson SchmidHome And Habits Of Wild Animals North American Mammals by Karl Patterson Schmid $9.89 Was: Previous Price $10.99
Mammals Of Pennsylvania Pa. Game Commission Sc Book 1967 Ned Smith CoverMammals Of Pennsylvania Pa. Game Commission Sc Book 1967 Ned Smith Cover $9.99 Key Guide To Australian Mammal Leonard Cronin 1991 Marion WestmacottKey Guide To Australian Mammal Leonard Cronin 1991 Marion Westmacott $11.95
Its a Baby Moose! (SandCastle: Baby Mammals)Its a Baby Moose! (SandCastle: Baby Mammals) $16.56 A Mob of Meerkats: And Other Mammal Groups by Louise A. Spilsbury (English) LibrA Mob of Meerkats: And Other Mammal Groups by Louise A. Spilsbury (English) Libr $39.45
Mammals (See Through)Mammals (See Through) $7.21 Antique Print/c1860s/Australian Mammals/Wallaby+/p54Antique Print/c1860s/Australian Mammals/Wallaby+/p54 $24.95
Vintage Metal Pewter Mianiature Manatee Sea Mammal Figurine 1.5" LongVintage Metal Pewter Mianiature Manatee Sea Mammal Figurine 1.5" Long $1.99 Pewter Whale Paper Weight Business Card Holder Desktop New Elegant Ocean MammalPewter Whale Paper Weight Business Card Holder Desktop New Elegant Ocean Mammal $15.51
The World of Mammals by Taglianti, Augusto VignaThe World of Mammals by Taglianti, Augusto Vigna $5.79 Prehistoric Creatures monsters mammals dynasty mpc multiple toymakers dinosaursPrehistoric Creatures monsters mammals dynasty mpc multiple toymakers dinosaurs $26.20
Prehistoric Mammals Coloring Book by Jan SovakPrehistoric Mammals Coloring Book by Jan Sovak $3.85 The Kingdon Pocket Guide to African Mammals (Princeton Pocket Guides)The Kingdon Pocket Guide to African Mammals (Princeton Pocket Guides) $9.51
Whales and Other Marine Mammals of Washington and Oregon, Tamara Eder, Ian SheldWhales and Other Marine Mammals of Washington and Oregon, Tamara Eder, Ian Sheld $6.04 Petrified Horse tooth fossil, 55.92g, 69mmPetrified Horse tooth fossil, 55.92g, 69mm $49.00
Life Nature Library: The Mammals by Richard Carrington (1963)Life Nature Library: The Mammals by Richard Carrington (1963) $2.99 Classifying Mammals (Classifying Living Things)-ExLibraryClassifying Mammals (Classifying Living Things)-ExLibrary $7.96
Studies of Birds and Mammals of South AmericaStudies of Birds and Mammals of South America $27.80 Guy Harvey Ladies Girls Gulf Mammals Fishing Boat T-Shirt. Spring Yellow. S-2XGuy Harvey Ladies Girls Gulf Mammals Fishing Boat T-Shirt. Spring Yellow. S-2X $24.00
Fantastic Mammals (Fast Facts)Fantastic Mammals (Fast Facts) $4.99 List price: Previous Price $11.99 Sterling Silver Family Pod of Dolphins Pendant Marine MammalSterling Silver Family Pod of Dolphins Pendant Marine Mammal $20.00
Hyracodon Lower Teeth, Fossil, Early Rhinoceros, Badlands, S Dak, Oligocene R540Hyracodon Lower Teeth, Fossil, Early Rhinoceros, Badlands, S Dak, Oligocene R540 $14.95 The Audubon Society Field Guide To North American Mammals, John O. Whitaker 1980The Audubon Society Field Guide To North American Mammals, John O. Whitaker 1980 $14.00
Bsa Mammal Study Merit Badge - Type H - Boy ScoutBsa Mammal Study Merit Badge - Type H - Boy Scout $3.79 Was: Previous Price $3.99 Mammals of Washington and OregonMammals of Washington and Oregon $6.24
Vampire Bats (Naturebooks: Mammals)-ExLibraryVampire Bats (Naturebooks: Mammals)-ExLibrary $3.99 Ecology of African Mammals (Tropical Ecology Series)Ecology of African Mammals (Tropical Ecology Series) $27.66
A Checklist to New Zealand Birds, Frogs, Reptiles, Mammals and Butterflies by KeA Checklist to New Zealand Birds, Frogs, Reptiles, Mammals and Butterflies by Ke $12.57 After the Dinosaurs: Mammoths and Fossil Mammals I Can Read Level 2After the Dinosaurs: Mammoths and Fossil Mammals I Can Read Level 2 $3.81
Moose Aluminum Grinder D2 63mm 4 Piece Elk Deer Herbivore Mammal Forest AnimalMoose Aluminum Grinder D2 63mm 4 Piece Elk Deer Herbivore Mammal Forest Animal $9.95 Departures - Mammals (Cd Used Like New)Departures - Mammals (Cd Used Like New) $11.51
Peterson Field Guide to Mammals of North America: Fourth Edition (Peterson FieldPeterson Field Guide to Mammals of North America: Fourth Edition (Peterson Field $9.74 Lot (3) Mammals Birds Underwater Fish Science Animal Fact Book Homeschool StudyLot (3) Mammals Birds Underwater Fish Science Animal Fact Book Homeschool Study $11.24 Was: Previous Price $14.99
Whales Sea Mammals Chart Vintage Style Marine Life Poster EphemeraWhales Sea Mammals Chart Vintage Style Marine Life Poster Ephemera $3.89 378 Awesome Possum Long Sleeve Shirt funny t-shirt mammal animal lover vegan new378 Awesome Possum Long Sleeve Shirt funny t-shirt mammal animal lover vegan new $18.00 to $23.00
Cave Bear Ursus Spelaeus fossil tooth Pleistocene Romania 1 1/4 inch Rare ed97Cave Bear Ursus Spelaeus fossil tooth Pleistocene Romania 1 1/4 inch Rare ed97 $29.99 Wildlife in Peril: The Endangered Mammals of Colorado-ExLibraryWildlife in Peril: The Endangered Mammals of Colorado-ExLibrary $3.99
Moose Glass Ashtray D2 4"x3" Elk Deer Herbivore Mammal Forest AnimalMoose Glass Ashtray D2 4"x3" Elk Deer Herbivore Mammal Forest Animal $9.95 National Geographic April 2003 Rise of Mammals/CavesNational Geographic April 2003 Rise of Mammals/Caves $1.60 Was: Previous Price $2.00
Mammals Of Arizona - New Paperback BookMammals Of Arizona - New Paperback Book $6.80 answers about dinosaurs and prehistoric mammals Grosset & Dunlap Rare Hcdj Vtganswers about dinosaurs and prehistoric mammals Grosset & Dunlap Rare Hcdj Vtg $15.00
Mammals of the Eastern United States Comstock BooksMammals of the Eastern United States Comstock Books $4.47 Game Mammals of Oklahoma: Wildlife Conservation Department (Paperback)Game Mammals of Oklahoma: Wildlife Conservation Department (Paperback) $7.95
If My Mom Were a Platypus : Mammal Babies and Their MothersIf My Mom Were a Platypus : Mammal Babies and Their Mothers $3.99 Conservation Biology Black-Footed Ferret - Mammalogy Mammals Natural HistoryConservation Biology Black-Footed Ferret - Mammalogy Mammals Natural History $12.00
(6) Bison Pleistocene Femurs(6) Bison Pleistocene Femurs $25.00 Mammals: Why Are Mammals Furry? (First Questions And Answers)Mammals: Why Are Mammals Furry? (First Questions And Answers) $3.99 List price: Previous Price $8.95
(4),Lg,Elephant,Cast Iron,Mammal,Kids Room,Den,Bath,Wall Hooks,Garden Decor,H-40(4),Lg,Elephant,Cast Iron,Mammal,Kids Room,Den,Bath,Wall Hooks,Garden Decor,H-40 $33.38 Was: Previous Price $38.81 Carefresh Natural Animal Bedding, 14L for Small MammalsCarefresh Natural Animal Bedding, 14L for Small Mammals $11.25 Trending at $12.25
Rare Weasel like Insectivore, Leptictis, Ictops Skull Section, Oligocene, I070Rare Weasel like Insectivore, Leptictis, Ictops Skull Section, Oligocene, I070 $19.95 Art Postcard of a Cat-like Fossa Mammal of MadagascarArt Postcard of a Cat-like Fossa Mammal of Madagascar $3.50
Humpback Whales (Living in the Wild: Sea Mammals)-ExLibraryHumpback Whales (Living in the Wild: Sea Mammals)-ExLibrary $3.77 Juvenile Hyracodon Lower Tooth, Fossil, Early Rhinoceros, Badlands S Dak, R536Juvenile Hyracodon Lower Tooth, Fossil, Early Rhinoceros, Badlands S Dak, R536 $10.95
Rare fossil petrified whale inner ear, 86.6g, 70 mmRare fossil petrified whale inner ear, 86.6g, 70 mm $99.00 Porcupine D1 8oz Stainless Steel Rodent Spiky Quills Forest Desert MammalPorcupine D1 8oz Stainless Steel Rodent Spiky Quills Forest Desert Mammal $10.95
Dakin prehistoric Wooly Mammoth Plush Vintage Nutshell Stuffed Toy 9" Long 1980Dakin prehistoric Wooly Mammoth Plush Vintage Nutshell Stuffed Toy 9" Long 1980 $14.99 Rep China (Taiwan) Endangered Mammals (2869) Official Po CardRep China (Taiwan) Endangered Mammals (2869) Official Po Card $3.00
Moose Flask D1 8oz Stainless Steel Elk Deer Herbivore Mammal Forest AnimalMoose Flask D1 8oz Stainless Steel Elk Deer Herbivore Mammal Forest Animal $10.95 LeapPad Pro interactive Science Amazing Mammals new sealed book & cartridge 2000LeapPad Pro interactive Science Amazing Mammals new sealed book & cartridge 2000 $7.25
Mammals by Donald Hoffmeister (English) Paperback BookMammals by Donald Hoffmeister (English) Paperback Book $7.62 Geological Enterprises Oligocene fossil Hyracodon toothGeological Enterprises Oligocene fossil Hyracodon tooth $13.99
Mammal (Dk Online)-ExLibraryMammal (Dk Online)-ExLibrary $9.86 The Life Cycle of Mammals (Life Cycles)-ExLibraryThe Life Cycle of Mammals (Life Cycles)-ExLibrary $5.96
Roger Tory Peterson Field Guide~ Mammals ~ Leather Easton PressRoger Tory Peterson Field Guide~ Mammals ~ Leather Easton Press $14.99 4 Bison Pleistocene Humorus4 Bison Pleistocene Humorus
Carving Marine Mammals with Power by Frank Russell (2017, Paperback)Carving Marine Mammals with Power by Frank Russell (2017, Paperback) $20.98 Marine Mammals of the North Atlantic (Princeton Field Guides)-ExLibraryMarine Mammals of the North Atlantic (Princeton Field Guides)-ExLibrary $3.99
Personalized Case For Galaxy Note 3/4/5 - Killer Whale, Orca, Ocean MammalPersonalized Case For Galaxy Note 3/4/5 - Killer Whale, Orca, Ocean Mammal $16.99 Creepy Mammals (Nature's Creepiest Creatures)-ExLibraryCreepy Mammals (Nature's Creepiest Creatures)-ExLibrary $16.08
When Giant Mammals Thundered: The Cenozoic Era Prehistoric North AmericaWhen Giant Mammals Thundered: The Cenozoic Era Prehistoric North America $4.28 The Half-Mammals of Dixie by George Singleton (English) Paperback BookThe Half-Mammals of Dixie by George Singleton (English) Paperback Book $19.44
Claws Animals Nature Mammals Reptiles Birds Amphibians Kids Book Dinosaurs PhotoClaws Animals Nature Mammals Reptiles Birds Amphibians Kids Book Dinosaurs Photo $1.23 Was: Previous Price $1.75 Woodland Mammals By Wendy Edelson (Complete) Large Pieces Bits & Pieces PuzzleWoodland Mammals By Wendy Edelson (Complete) Large Pieces Bits & Pieces Puzzle $4.10
Read Well Mammals (Units 11, 12, 13)Read Well Mammals (Units 11, 12, 13) $3.99 What is a Marine Mammal? (The Science of Living Things)What is a Marine Mammal? (The Science of Living Things) $3.98
Fossils-Eight Rare Miocene Ray & Skate Dermal Spines -8Fossils-Eight Rare Miocene Ray & Skate Dermal Spines -8 $12.49 1968 Mark Trail's Book of Animals (North American Mammals) by Ed Dodd1968 Mark Trail's Book of Animals (North American Mammals) by Ed Dodd $4.99
How to Know the American Mammals by Ivan Sanderson c. 1951 1957 Signet Vtg PbHow to Know the American Mammals by Ivan Sanderson c. 1951 1957 Signet Vtg Pb $5.99 (2) Bison complete Jaws/ (1) partial(2) Bison complete Jaws/ (1) partial $45.00
The Mammal Guide by Ralph Palmer 1954 Mammals of North America north of MexicoThe Mammal Guide by Ralph Palmer 1954 Mammals of North America north of Mexico $3.00 Hyracodon Lower Tooth, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R535Hyracodon Lower Tooth, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R535 $11.95
Bbc Video The Life of Mammals Hosted by David Attenborough 4DvdsBbc Video The Life of Mammals Hosted by David Attenborough 4Dvds $16.00 Two Pewter Armadillo Texas Mammal Memo Clips Photo Holders Desk DecorTwo Pewter Armadillo Texas Mammal Memo Clips Photo Holders Desk Decor $17.99
Culbertsoni oreodont skullCulbertsoni oreodont skull $75.00 Sean Landers : North American Mammals (2015, Hardcover)Sean Landers : North American Mammals (2015, Hardcover) $30.00
Mammal Study Merit Badge, Type J "Scout Stuff" Back (2002-10), Mint!Mammal Study Merit Badge, Type J "Scout Stuff" Back (2002-10), Mint! $8.99 Vintage 1978 Mammals Monkeys zebra Whale Panini Sticker Album Book New UnusedVintage 1978 Mammals Monkeys zebra Whale Panini Sticker Album Book New Unused $6.99
Dolphins, Seals, and Other Sea Mammals (Undersea Encounters) (ExLib)Dolphins, Seals, and Other Sea Mammals (Undersea Encounters) (ExLib) $3.99 Boy Scouts of American Venture Mammal Study (714)Boy Scouts of American Venture Mammal Study (714) $10.50
Click to see more Mammal items at www.ebay.com
Prices current as of last update, 09/19/17 4:20am.

Home Contact Resources Exchange Links eBay