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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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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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		Miocene Fossil Bones Collections - Ribs & Misc. - from Western NebraskaNew listing Miocene Fossil Bones Collections - Ribs & Misc. - from Western Nebraska $10.00 New listing
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Jaw Bone And Teeth From Unidentified Animal - 7 1/2"Jaw Bone And Teeth From Unidentified Animal - 7 1/2" $9.99 Ice Age Cave Bear Limb Bone Fossil Romania with Display Label Pleistocene AgeIce Age Cave Bear Limb Bone Fossil Romania with Display Label Pleistocene Age $20.00
Fossils/ Lot of misc. bones & pieces Mosasaur and others Cretaceous 17 specimensFossils/ Lot of misc. bones & pieces Mosasaur and others Cretaceous 17 specimens $18.00 New listing
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Ia 4 Fossil Ice Age Elk Cannon Leg BoneIa 4 Fossil Ice Age Elk Cannon Leg Bone $45.76 Rare Pair of Early Miocene Anchippus Teeth Florida FossilsRare Pair of Early Miocene Anchippus Teeth Florida Fossils $45.00
Fossilized Mammal Vertebrae Vert East Coast River Fossil Research SpecimenFossilized Mammal Vertebrae Vert East Coast River Fossil Research Specimen $9.92 Huge Xl fossil Allodesmus tooth molar Miocene Shark Tooth Hill BakersfieldHuge Xl fossil Allodesmus tooth molar Miocene Shark Tooth Hill Bakersfield $44.99
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Oreodont Jaw Section on Matrix, Merycoidodon Fossil, Badlands, S. Dakota, O1241Oreodont Jaw Section on Matrix, Merycoidodon Fossil, Badlands, S. Dakota, O1241 $11.95 Vintage Fossil Dragonfly Natural Mammoth Fossil Hand Carved Pendant Loss PeaceVintage Fossil Dragonfly Natural Mammoth Fossil Hand Carved Pendant Loss Peace $64.00
Wsd-10 Fossil Cetacean Mammal Whale Tooth Shark Tooth Hill Bakersfield Fire ZoneWsd-10 Fossil Cetacean Mammal Whale Tooth Shark Tooth Hill Bakersfield Fire Zone $37.50 Equus Complicatus Pleistocene Fossil Horse Tooth PrehistoricEquus Complicatus Pleistocene Fossil Horse Tooth Prehistoric $29.95
Short Faced Bear Medial Phalanx Toe Bone Spectacled Tooth Teeth Florida FossilsShort Faced Bear Medial Phalanx Toe Bone Spectacled Tooth Teeth Florida Fossils $40.00 TuskTusk $22.40
old Titanothere Fossil on Stand under Glass Dome from Montana 1991old Titanothere Fossil on Stand under Glass Dome from Montana 1991 $49.99 Wsd-19 Fossil Mammal Seal Rooted Tooth Shark Tooth Hill Bakersfield Fire ZoneWsd-19 Fossil Mammal Seal Rooted Tooth Shark Tooth Hill Bakersfield Fire Zone $75.00
Mammoth Bone 13 inches AuthenticMammoth Bone 13 inches Authentic $40.99 New National Geographic Skelesaurus Tyrannosaurus RexNew National Geographic Skelesaurus Tyrannosaurus Rex $19.99
Oreodont Upper Tooth, Merycoidodon Fossil, Badlands, S Dakota, Oligocene, O1236Oreodont Upper Tooth, Merycoidodon Fossil, Badlands, S Dakota, Oligocene, O1236 $6.95 Fossilized SpineFossilized Spine $25.00
Mammoth Hair - Large Clump ! , Mammoth primigenius, 10,000 - 30,000 yrs SiberiaMammoth Hair - Large Clump ! , Mammoth primigenius, 10,000 - 30,000 yrs Siberia $54.99 Equus Complicatus Pleistocene Fossil Horse Tooth Prehistoric ExtinctEquus Complicatus Pleistocene Fossil Horse Tooth Prehistoric Extinct $29.95
Rare Fantastic High Quality Camel Hoof Florida Fossil MammalRare Fantastic High Quality Camel Hoof Florida Fossil Mammal $30.00 Wsd-21 Fossil Mammal Seal Crown of Tooth Shark Tooth Hill BakersfieldWsd-21 Fossil Mammal Seal Crown of Tooth Shark Tooth Hill Bakersfield $45.00
Hyracodon Jaw Section, Early Rhinoceros Fossil, Badlands, S Dako Oligocene, R786Hyracodon Jaw Section, Early Rhinoceros Fossil, Badlands, S Dako Oligocene, R786 $13.95 Wsd-14 Fossil Cetacean Mammal Whale Most Root Tooth Shark Tooth Hill X3Wsd-14 Fossil Cetacean Mammal Whale Most Root Tooth Shark Tooth Hill X3 $30.00
Fossil Miocene Whale humerus proximal distal ends Bakersfield CetaceanFossil Miocene Whale humerus proximal distal ends Bakersfield Cetacean $32.00 Wsd-27 Fossil Mammal Porpoise Rooted Tooth Shark Tooth Hill BakersfieldWsd-27 Fossil Mammal Porpoise Rooted Tooth Shark Tooth Hill Bakersfield $56.25
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		Marine Sea Avian Bird Humerus Arm Bone 5” Sun BleachedNew listing Marine Sea Avian Bird Humerus Arm Bone 5” Sun Bleached $9.99 Hyracodon Jaw Section, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R789Hyracodon Jaw Section, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R789 $39.95
Ice Age Cave Bear Skull Fossil from Romania with Display Label Pleistocene AgeIce Age Cave Bear Skull Fossil from Romania with Display Label Pleistocene Age $50.00 Fossil Prehistoric Horse Tooth Teeth Mammal Equus 2 3/4 " 2.3 Ounces Horse ToothFossil Prehistoric Horse Tooth Teeth Mammal Equus 2 3/4 " 2.3 Ounces Horse Tooth $14.95
Wsd-9 Fossil Cetacean Mammal Whale Tooth Shark Tooth Hill BakersfieldWsd-9 Fossil Cetacean Mammal Whale Tooth Shark Tooth Hill Bakersfield $45.00 3 Authentic Prehistoric Horse Teeth. Ice Age Pleistocene River Fossil3 Authentic Prehistoric Horse Teeth. Ice Age Pleistocene River Fossil $30.00
Whale Vertebra, Fossil, Great ConditionWhale Vertebra, Fossil, Great Condition $45.00 Fossil Bison Vertebrae Lowcountry ScFossil Bison Vertebrae Lowcountry Sc $19.00
Fossil Lot Seed Teeth Bone etc Horse Mastodon TapirFossil Lot Seed Teeth Bone etc Horse Mastodon Tapir $25.00 Ia 12 Fossil Ice Age Stag Moose Ankle BoneIa 12 Fossil Ice Age Stag Moose Ankle Bone $19.36
Ia 1 Fossil Ice Age Bone Elk FemurIa 1 Fossil Ice Age Bone Elk Femur $45.76 Fossil Capybara metapodial foot toe Florida PleistoceneFossil Capybara metapodial foot toe Florida Pleistocene $11.00
Fine Fossil Whlae Tooth Lee Creek Fossils Megalodon FoodFine Fossil Whlae Tooth Lee Creek Fossils Megalodon Food $59.00 Ultra Rare fossil Allodesmus carpal Miocene Shark Tooth Hill BakersfieldUltra Rare fossil Allodesmus carpal Miocene Shark Tooth Hill Bakersfield $24.99
1 - Fossilized Horse Medial Phalanx - Foot Bone from a North Florida River1 - Fossilized Horse Medial Phalanx - Foot Bone from a North Florida River $2.99 Geological Enterprises Oligocene fossil, Turtle Egg WyomingGeological Enterprises Oligocene fossil, Turtle Egg Wyoming $59.99
Fossil Manatee proximal phalange finger large Pleistocene FloridaFossil Manatee proximal phalange finger large Pleistocene Florida $14.00 2.4" Fossil Whale Vertebrae York Town Formation Aurora, Nc Miocene Age Mammal2.4" Fossil Whale Vertebrae York Town Formation Aurora, Nc Miocene Age Mammal $21.24 Was:  Previous Price $24.99
Rare fossil Turtle Trachemys platymarginata nuchal bone Florida Blancan HugeRare fossil Turtle Trachemys platymarginata nuchal bone Florida Blancan Huge $26.99 Cb-18 Fossil Ice Age Bones x10 Random PiecesCb-18 Fossil Ice Age Bones x10 Random Pieces $8.45
Complete Muskrat Upper Jaw Florida FossilsComplete Muskrat Upper Jaw Florida Fossils $59.00 Rare early fossil Tortoise claw Hesperotestudo Florida BlancanRare early fossil Tortoise claw Hesperotestudo Florida Blancan $26.99
Fossils/
00004000
 Lot of misc bones & pieces Mosasaur and others Cretaceous 15 specimensFossils/ 00004000 Lot of misc bones & pieces Mosasaur and others Cretaceous 15 specimens $13.00 4 piece Mineral collection Rose quartz, Selenite, Desert Rose, Honey calcite4 piece Mineral collection Rose quartz, Selenite, Desert Rose, Honey calcite $22.50
Fossil Cetacean Tooth Aurora Fossil Cetacean Tooth Aurora  $19.00 Fossil Tooth Jaw Skull Homogolax Early Eocene Oligocene Mammal ExtinctFossil Tooth Jaw Skull Homogolax Early Eocene Oligocene Mammal Extinct $50.00
Vertebrae Fossils, Deep South Mammal Fossil VertebraeVertebrae Fossils, Deep South Mammal Fossil Vertebrae $9.99 Vintage Buffalo Bone Native American Woman Natural Hand Carved PendantVintage Buffalo Bone Native American Woman Natural Hand Carved Pendant $49.00
Fossil Armadillo metapodial foot toe bone Dasypus bellus Pleistocene FloridaFossil Armadillo metapodial foot toe bone Dasypus bellus Pleistocene Florida $17.00 Ultra Rare fossil Allodesmus tarsal bone Miocene CaliforniaUltra Rare fossil Allodesmus tarsal bone Miocene California $24.99
Ia 5 Fossil Ice Age Elk Leg BoneIa 5 Fossil Ice Age Elk Leg Bone $45.76 Unusual Fossil Mole Humerus Florida FossilsUnusual Fossil Mole Humerus Florida Fossils $24.00
Nice Florida Fossil Collection; Huge Incisors, Canines, Rooted Tapir TeethNice Florida Fossil Collection; Huge Incisors, Canines, Rooted Tapir Teeth $79.99 Fossil Horse Teeth in jaw segment - A - Pliocene Epoch - South DakotaFossil Horse Teeth in jaw segment - A - Pliocene Epoch - South Dakota $18.00
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		Fossilized Dugong Rib Bone Venice, Florida with shark feeding marks.New listing Fossilized Dugong Rib Bone Venice, Florida with shark feeding marks. $6.50 New listing
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Poebrotherium, Camel Jaw. White River Badlands, Nw NebraskaPoebrotherium, Camel Jaw. White River Badlands, Nw Nebraska $25.00 Oreodont Jaw Section,Fossil Merycoidodon, Badlands, S Dakota, Oligocene, O1238Oreodont Jaw Section,Fossil Merycoidodon, Badlands, S Dakota, Oligocene, O1238 $9.95
1/4" Otodus Shark Vertebrae bone Fossil from Morocco 10 pcs dinosaur1/4" Otodus Shark Vertebrae bone Fossil from Morocco 10 pcs dinosaur $9.95 New listing
		6 Ice Age Horse Equus Bison Teeth Ga Fl Al Fossil ~22~New listing 6 Ice Age Horse Equus Bison Teeth Ga Fl Al Fossil ~22~ $15.00
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		Extinct Cave Bear Claw with Toe Bones - Ice Age Fossil - Ursus spelaeusNew listing Extinct Cave Bear Claw with Toe Bones - Ice Age Fossil - Ursus spelaeus $19.99 Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age'Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age' $20.00
Fossilized Whale Tooth Alaskan findFossilized Whale Tooth Alaskan find $70.00 Whooly Mammoth Toe BoneWhooly Mammoth Toe Bone $15.00
Mastodon Tooth Partial Florida Fossil Teeth Ms10Mastodon Tooth Partial Florida Fossil Teeth Ms10 $17.50 Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age.Ice Age Cave Bear Finger Bone Fossil Romania with Display Label Pleistocene Age. $30.00
Pristine fossil White-Tailed Deer hoof Odocoileus Fl Must See! Color!Pristine fossil White-Tailed Deer hoof Odocoileus Fl Must See! Color! $14.99 New listing
		ancient? Fossilized ?Vertebrae? Bone fossilNew listing ancient? Fossilized ?Vertebrae? Bone fossil $29.99
pleistocene fossilspleistocene fossils $7.50 Equus Complicatus Pleistocene Fossil Horse Tooth ExtinctEquus Complicatus Pleistocene Fossil Horse Tooth Extinct $29.95
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		Fossilized Dugong Rib Bone Venice, FloridaNew listing Fossilized Dugong Rib Bone Venice, Florida $6.50 1/2 " - 1 1/4 " Squalicorax Shark Tooth Moroccan Fossil Teeth 5 pcs1/2 " - 1 1/4 " Squalicorax Shark Tooth Moroccan Fossil Teeth 5 pcs $11.95
Hyracodon Lower Teeth, Fossils, Early Rhinoceros, Badlands, Oligocene, R782Hyracodon Lower Teeth, Fossils, Early Rhinoceros, Badlands, Oligocene, R782 $20.95 New listing
		Florida Fossil Mammal Skull Fragment LotNew listing Florida Fossil Mammal Skull Fragment Lot $35.00
Ia 25 Fossil Ice Age Bison ToothIa 25 Fossil Ice Age Bison Tooth $10.56 Ia 17 Fossil Ice Age Stag Moose Cannon Limb BoneIa 17 Fossil Ice Age Stag Moose Cannon Limb Bone $98.56
Wsd-4 Fossil Cetacean Mammal Whale Tooth Not Rooted Shark Tooth Hill BakersfieldWsd-4 Fossil Cetacean Mammal Whale Tooth Not Rooted Shark Tooth Hill Bakersfield $60.00 Early Camel Jaw Section, Poebrotherium Fossil, Badlands South Dakota, Oligo P319Early Camel Jaw Section, Poebrotherium Fossil, Badlands South Dakota, Oligo P319 $8.95
Wsd-11 Fossil Cetacean Mammal Whale Most Root Tooth Shark Tooth Hill BakersfieldWsd-11 Fossil Cetacean Mammal Whale Most Root Tooth Shark Tooth Hill Bakersfield $30.00 Rhino Teeth, From West Nebraska, Near Perfect *Special* (Rht20191)Rhino Teeth, From West Nebraska, Near Perfect *Special* (Rht20191) $44.50
B8 Fossil Cetacean Bulla Inner Ear Bone Mammal Extinct WhaleB8 Fossil Cetacean Bulla Inner Ear Bone Mammal Extinct Whale $7.09 Tapir Tooth Fossil Fossilized Ice Age Florida Rock historical research mammalTapir Tooth Fossil Fossilized Ice Age Florida Rock historical research mammal $12.92
Prehistoric Fossil Horse Tooth Equus Complicatus Pleistocene Age Florida E14Prehistoric Fossil Horse Tooth Equus Complicatus Pleistocene Age Florida E14 $9.95 Lot of 6 Mammal Fossil Bones Florida Ears Vertebrae PleistoceneLot of 6 Mammal Fossil Bones Florida Ears Vertebrae Pleistocene $12.99
Ice Age Bison, antiquus Bone from Otoe County Nebraska, Usa with Display LabelIce Age Bison, antiquus Bone from Otoe County Nebraska, Usa with Display Label $20.00 1 1/4" -1 1/2" Mosasaur Tooth Moroccan Fossil Teeth 10 pcs dinosaur prehistoric1 1/4" -1 1/2" Mosasaur Tooth Moroccan Fossil Teeth 10 pcs dinosaur prehistoric $17.95
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