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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...

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MammalMammal
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AnteaterAnteater
AntelopeAntelope
ApeApe
ArmadilloArmadillo
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BandicootBandicoot
BatBat
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BeaverBeaver
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KoalaKoala
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LynxLynx
ManateeManatee
MarmotMarmot
MarsupialMarsupial
MeercatMeercat
MinkMink
MoleMole
MongooseMongoose
MonkeyMonkey
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MouseMouse
MuleMule
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OppossumOppossum
OrangutanOrangutan
OrcaOrca
OtterOtter
PangolinPangolin
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PorcupinePorcupine
PorpoisePorpoise
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Prairie DogPrairie Dog
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RatRat
RhinocerosRhinoceros
RodentRodent
SealSeal
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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


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Titanothere Partial Upper Tooth, Brontothere Fossil, South Dakota, No Resto T542Titanothere Partial Upper Tooth, Brontothere Fossil, South Dakota, No Resto T542 $49.95 New listing
		30 Fossil shark Vertebra, Eocene, VirginiaNew listing 30 Fossil shark Vertebra, Eocene, Virginia $12.00
Skull Bottle Opener Novelty Figure Skeleton Grade A Bronze Vintage PatinaSkull Bottle Opener Novelty Figure Skeleton Grade A Bronze Vintage Patina $24.99 prehistoric fossilized whale ear boneprehistoric fossilized whale ear bone $7.99
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wooly mammoth bone Fragmentswooly mammoth bone Fragments $45.00 Fossil Camel Jaw From South DakotaFossil Camel Jaw From South Dakota $25.50
Huge Section Giant Tortoise Shell Florida Fossils Ice Age Turtle Bones Extinct @Huge Section Giant Tortoise Shell Florida Fossils Ice Age Turtle Bones Extinct @ $4.25 New listing
		Fossil Cetacean (Whale) Vertebra, Miocene, VirginiaNew listing Fossil Cetacean (Whale) Vertebra, Miocene, Virginia $15.00
Pleisticene Era (2.58Mya to 11.7Tya) Bison Fossil - Primitive Hand-made Fossil TPleisticene Era (2.58Mya to 11.7Tya) Bison Fossil - Primitive Hand-made Fossil T $95.00 Horse Tooth Fossil - No RestorationsHorse Tooth Fossil - No Restorations $10.00
Early Deer, Leptomeryx evansi, Fossil Jaw Section, Badlands, South Dakota, D346Early Deer, Leptomeryx evansi, Fossil Jaw Section, Badlands, South Dakota, D346 $7.95 Merychippus- Miocene Horse Partial Jaw- prehistoric fossilMerychippus- Miocene Horse Partial Jaw- prehistoric fossil $95.00
Merycoidodon culbertsoni Partial Upper – NiceMerycoidodon culbertsoni Partial Upper – Nice $26.00 Nice Mastodon Tooth Florida Fossils Ice Age Mammooth Teeth Bones Extinct Skull @Nice Mastodon Tooth Florida Fossils Ice Age Mammooth Teeth Bones Extinct Skull @ $1.99
5 Super Detailed Fossil Deer Antlers Florida Fossils Horn Bones Ice Age Skull Nr5 Super Detailed Fossil Deer Antlers Florida Fossils Horn Bones Ice Age Skull Nr $9.70 Bison Vertebra Fossil Pleistocene Bison Buffalo Bn11Bison Vertebra Fossil Pleistocene Bison Buffalo Bn11 $29.00
2 Very Large Sections Mastodon Tsuk Florida Fossils Mammooth Bones Tooth Teeth @2 Very Large Sections Mastodon Tsuk Florida Fossils Mammooth Bones Tooth Teeth @ $5.50 10 Carnivore Canine Teeth Florida Fossils Ice Age Tooth Jaw Bones Wolf Cat Bear10 Carnivore Canine Teeth Florida Fossils Ice Age Tooth Jaw Bones Wolf Cat Bear $9.15
Flat Rate Box Of Fossil Bones Florida Fossils Ice Age Mastodon Tooth MammalFlat Rate Box Of Fossil Bones Florida Fossils Ice Age Mastodon Tooth Mammal $2.25 Excellent Colorful Panther Premolor Tooth Florida Fossil Mammal TeethExcellent Colorful Panther Premolor Tooth Florida Fossil Mammal Teeth $75.00
Horse Tooth Fossil - Great Preservation - No RestorationsHorse Tooth Fossil - Great Preservation - No Restorations $15.00 2 Rare Sloth Rib Bones Florida Fossils Ice Age Extinct Claw Core Tooth Jaw Skull2 Rare Sloth Rib Bones Florida Fossils Ice Age Extinct Claw Core Tooth Jaw Skull $1.99
5 Rare Sloth Teeth Florida Fossils Ice Age Claw Core Tooth Jaw Bones Skull Paleo5 Rare Sloth Teeth Florida Fossils Ice Age Claw Core Tooth Jaw Bones Skull Paleo $6.50 Outstanding Colorful Mastodon Tooth Partial Florida Fossil Mammal TeethOutstanding Colorful Mastodon Tooth Partial Florida Fossil Mammal Teeth $26.00
34 Million Year Old Fossil Merycoidodontidae Teeth Museum Riker Mount S. Dakota34 Million Year Old Fossil Merycoidodontidae Teeth Museum Riker Mount S. Dakota $29.99 Mastodon Partial Tooth Early Miocene late Pliocene Fossil & Label M1Mastodon Partial Tooth Early Miocene late Pliocene Fossil & Label M1 $14.95
10 Fossil Horse Teeth Florida Fossils Ice Age Equus Tooth Jaw Bones Extinct Fl @10 Fossil Horse Teeth Florida Fossils Ice Age Equus Tooth Jaw Bones Extinct Fl @ $1.99 Equus Complicatus Pleistocene Fossil Horse ToothEquus Complicatus Pleistocene Fossil Horse Tooth $29.95
Fossilized BoneFossilized Bone $9.99 Allodesmus tooth Round Mountain Silt Kern Co California Allodesmus tooth Round Mountain Silt Kern Co California  $37.50
Woolly Mammoth Real Fur Hair Wooly Permafrost Bone Large Wool Mastodon ExtinctWoolly Mammoth Real Fur Hair Wooly Permafrost Bone Large Wool Mastodon Extinct $49.95 bison tooth historic river find vivianitebison tooth historic river find vivianite $24.90
Horse Tooth Fossil - Excellent Specimen - No RestorationsHorse Tooth Fossil - Excellent Specimen - No Restorations $35.00 Alticamelus Repaired Jaw-miocene camel- prehistoric fossilAlticamelus Repaired Jaw-miocene camel- prehistoric fossil $45.00
Fully Rooted Bison Tooth 50,000 Years Old Fossil with Coa Museum qualityFully Rooted Bison Tooth 50,000 Years Old Fossil with Coa Museum quality $29.95 9 Outstanding Giant Armadillo Scutes Florida Fossil Mammal9 Outstanding Giant Armadillo Scutes Florida Fossil Mammal $9.99
Superb Beautiful Horse Leg Bone Fragment Fossil Ice Age Mammal w/ DisplaySuperb Beautiful Horse Leg Bone Fragment Fossil Ice Age Mammal w/ Display $10.00 Large Bone Valley Crocodile Tooth Florida Fossils Alligator Teeth Jaw Bones Fl @Large Bone Valley Crocodile Tooth Florida Fossils Alligator Teeth Jaw Bones Fl @ $35.00
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5 Uncommon Rooted Alligator Teeth Florida Fossils Crocodile Tooth Jaw Bones Nr @5 Uncommon Rooted Alligator Teeth Florida Fossils Crocodile Tooth Jaw Bones Nr @ $1.99 Vintage Antler Bone Thermometer Celsius with Turquoise LeafVintage Antler Bone Thermometer Celsius with Turquoise Leaf $29.99
High Quality Colorful Mastodon Tooth Partial Florida Fossil Mammal TeethHigh Quality Colorful Mastodon Tooth Partial Florida Fossil Mammal Teeth $31.00 Carnivore Fossil Tooth Jaguar Saber Cat LionCarnivore Fossil Tooth Jaguar Saber Cat Lion $66.66
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Ice Age Fossil Deer Lumbar Vertebrae Back Bone 6 Inches! Pleistocene Florida!Ice Age Fossil Deer Lumbar Vertebrae Back Bone 6 Inches! Pleistocene Florida! $20.00 Regalia Fossil Bone Deer Coyote Wolf or ? jaw bone w teeth Indian beads Rare 11"Regalia Fossil Bone Deer Coyote Wolf or ? jaw bone w teeth Indian beads Rare 11" $24.77
Rare Colorful Panther Tooth Florida Fossil Mammal TeethRare Colorful Panther Tooth Florida Fossil Mammal Teeth $51.00 Virginia Possum Skull, Parts.Virginia Possum Skull, Parts. $6.00
2 Fossilized Whale Ear Bones2 Fossilized Whale Ear Bones $19.99 Mammoth Tooth FragmentMammoth Tooth Fragment $90.00
Pleistocene Bison Horn Core from AlaskaPleistocene Bison Horn Core from Alaska $100.00 Rare Grey Fox Mandible Jaw Bone Florida Fossils Ice Age Wolf Canid Tooth Teeth @Rare Grey Fox Mandible Jaw Bone Florida Fossils Ice Age Wolf Canid Tooth Teeth @ $4.25
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		White river Poebrotherium(camel) ToothNew listing White river Poebrotherium(camel) Tooth $10.00 Hyracodon Lower Teeth, Fossil, Early Rhinoceros, Badlands, Sd, Oligocene, R888Hyracodon Lower Teeth, Fossil, Early Rhinoceros, Badlands, Sd, Oligocene, R888 $19.95
Fossil Manatee Tooth Gilchrist County Florida Research Mammal CollectibleFossil Manatee Tooth Gilchrist County Florida Research Mammal Collectible $14.00 6 Sections Extinct Giant Box Turtle Shell Florida Fossils Tortoise Bones Skull @6 Sections Extinct Giant Box Turtle Shell Florida Fossils Tortoise Bones Skull @ $1.99
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		Hyracodon jaw section with tooth. Rhino, white river badlandsNew listing Hyracodon jaw section with tooth. Rhino, white river badlands $12.00 Fantastic Chocolate Brown Giant Ground Sloth Tooth Florida Fossil Mammal TeethFantastic Chocolate Brown Giant Ground Sloth Tooth Florida Fossil Mammal Teeth $20.49
Large Allodesmus Canine Bakersfield Shark Tooth Hill FossilsLarge Allodesmus Canine Bakersfield Shark Tooth Hill Fossils $65.00 1 broken fossil horse tooth per lot.1 broken fossil horse tooth per lot. $1.60 Was:  Previous Price $2.00
Rare Fossil Occipital, Back of the Skull, Megalodon Era FossilRare Fossil Occipital, Back of the Skull, Megalodon Era Fossil $35.00 2 Rare Extinct Giant Box Turtle Shells Florida Fossils Ice Age Tortoise Bones Nr2 Rare Extinct Giant Box Turtle Shells Florida Fossils Ice Age Tortoise Bones Nr $1.99
Very Nice Sloth Claw Core Florida Fossils Ice Age Extinct Bones Tooth MegalonyxVery Nice Sloth Claw Core Florida Fossils Ice Age Extinct Bones Tooth Megalonyx $76.00 Florida Fossil Tooth Collection Teeth Fossils Bones Mammal Ice Age Extinct SkullFlorida Fossil Tooth Collection Teeth Fossils Bones Mammal Ice Age Extinct Skull $7.50
Huge Mastodon Vertebra Florida Fossils Ice Age Mammooth Bones Tooth Teeth SkullHuge Mastodon Vertebra Florida Fossils Ice Age Mammooth Bones Tooth Teeth Skull $1.99 fossil bison molars, partial and complete specimensfossil bison molars, partial and complete specimens $5.00
Titanothere Bone Fragment White River Formation Eastern Wyoming, UsaTitanothere Bone Fragment White River Formation Eastern Wyoming, Usa $12.00 Deluxe High Quality Mamooth Spit Tooth Florida Fossil Mammal TeethDeluxe High Quality Mamooth Spit Tooth Florida Fossil Mammal Teeth $9.99
Choice Alligator Scute Florida Fossils Ice Age Osteoderm Bones Skeleton Tooth FlChoice Alligator Scute Florida Fossils Ice Age Osteoderm Bones Skeleton Tooth Fl $25.00 Mammoth fossil Bark Tusk 1 lb - Knife Making/Crafts #2Mammoth fossil Bark Tusk 1 lb - Knife Making/Crafts #2 $100.00 Was:  Previous Price $125.00
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Fully Rooted Bison Tooth 15,000- 50,000 Years Old? Fossil Museum QualityFully Rooted Bison Tooth 15,000- 50,000 Years Old? Fossil Museum Quality $50.00 2 Exceptional Deer Mandible Jaw Bones Florida Fossils Ice Age Tooth Teeth Skull2 Exceptional Deer Mandible Jaw Bones Florida Fossils Ice Age Tooth Teeth Skull $4.25
Set of Fossil Horse Leg Bones (Some Association)Set of Fossil Horse Leg Bones (Some Association) $36.00 large miocene whale vertabralarge miocene whale vertabra $75.00
Florida Fossil Deer Tooth Pleistocene Mammoth Age MammalFlorida Fossil Deer Tooth Pleistocene Mammoth Age Mammal $9.99 5 Rare Deadly Fossil Sting Ray Barbs Florida Fossils Ice Age Stinger Stingray Nr5 Rare Deadly Fossil Sting Ray Barbs Florida Fossils Ice Age Stinger Stingray Nr $1.99
2 Florida Fossil Giant Armadillo Body Armor Scutes ice age teeth tooth2 Florida Fossil Giant Armadillo Body Armor Scutes ice age teeth tooth $6.50 Carnivore Fossil Tooth Jaguar Saber Cat LionCarnivore Fossil Tooth Jaguar Saber Cat Lion $66.66
Rare Dire Wolf Metapodial Toe Bone Florida Fossils Tooth Saber Cat Skeleton Nr @Rare Dire Wolf Metapodial Toe Bone Florida Fossils Tooth Saber Cat Skeleton Nr @ $1.99 New listing
		White River Hyracodon(rhino) upper toothNew listing White River Hyracodon(rhino) upper tooth $20.00
Horse Tooth Fossil - Beautiful Specimen - No RestorationsHorse Tooth Fossil - Beautiful Specimen - No Restorations $38.00 Equus Complicatus Pleistocene Fossil Horse Tooth Prehistoric Horse ToothEquus Complicatus Pleistocene Fossil Horse Tooth Prehistoric Horse Tooth $29.95
Prehistoric Fossil Horse Tooth Equus Complicatus Pleistocene Age Florida Eq40Prehistoric Fossil Horse Tooth Equus Complicatus Pleistocene Age Florida Eq40 $9.95 Equus Complicatus Pleistocene Fossil Horse Tooth ExtinctEquus Complicatus Pleistocene Fossil Horse Tooth Extinct $29.95
Leptomeryx Deer-like animal white river formation oligocene epoch partial jawLeptomeryx Deer-like animal white river formation oligocene epoch partial jaw $74.99 Fossil Rare Jaw Homogolax Early Eocene Oligocene Mammal ExtinctFossil Rare Jaw Homogolax Early Eocene Oligocene Mammal Extinct $50.00
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