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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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Hyaenodon horridus, Upper Tooth, Badlands, South Dakota, Oligocene, 30 Mya, K243Hyaenodon horridus, Upper Tooth, Badlands, South Dakota, Oligocene, 30 Mya, K243 $62.95 Was: Previous Price $69.95 Large Miocene Fossil Pinniped Bone Sharktooth Hill Round Mountain Silt 055Large Miocene Fossil Pinniped Bone Sharktooth Hill Round Mountain Silt 055 $10.00
fossil Bison Phalanx Bone Lot Of 2 Ice Age Pleistocene Age Missouri Riverfossil Bison Phalanx Bone Lot Of 2 Ice Age Pleistocene Age Missouri River $12.00 Fvl#1 - Fossil Vertebrae from the Miocene Bone Bed of Kern County, CaliforniaFvl#1 - Fossil Vertebrae from the Miocene Bone Bed of Kern County, California $24.99
Awesome fossil Fox maxilla Urocyon Florida Must See! skull teeth tooth Pretty!Awesome fossil Fox maxilla Urocyon Florida Must See! skull teeth tooth Pretty! $99.99 (v854) 1-7/8" Rare Extinct Fossil Siberian Woolly Mammoth Tooth pendant necklace(v854) 1-7/8" Rare Extinct Fossil Siberian Woolly Mammoth Tooth pendant necklace $89.99
Hyracodon Upper Teeth, Fossil, Early Rhinoceros, Badlands, S Dak, Oligocene R601Hyracodon Upper Teeth, Fossil, Early Rhinoceros, Badlands, S Dak, Oligocene R601 $40.45 Was: Previous Price $44.95 Tapir Tooth Fossil Fossilized Ice Age Florida Rock historical research mammalTapir Tooth Fossil Fossilized Ice Age Florida Rock historical research mammal $15.85
Nice Titanothere Rib Bone Section, Fossil, Badlands, South Dakota, T296Nice Titanothere Rib Bone Section, Fossil, Badlands, South Dakota, T296 $17.95 Was: Previous Price $19.95 Hyracodon Lower Tooth on Matrix, Fossil, Early Rhinoceros, Badlands S Dak, R527Hyracodon Lower Tooth on Matrix, Fossil, Early Rhinoceros, Badlands S Dak, R527 $10.75 Was: Previous Price $11.95
Fossilized Whale Inner Ear DrumFossilized Whale Inner Ear Drum $80.00 Geological Enterprises Pleistoce fossil tooth, Castor Beaver from FloridaGeological Enterprises Pleistoce fossil tooth, Castor Beaver from Florida $12.99
Fossilized Mammoth Bone from Interior Alaska ,Fossilized Mammoth Bone from Interior Alaska , $6.75 Nice Mammoth or Steppe Bison Petrified 20,000 year old femur/leg bone.very niceNice Mammoth or Steppe Bison Petrified 20,000 year old femur/leg bone.very nice $70.00
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Fossil Camel Astragalus Bone Fossilized Artiodactyl Ice Age Llama footFossil Camel Astragalus Bone Fossilized Artiodactyl Ice Age Llama foot $18.00 Titanothere, Brontothere Upper Tooth, Fossil, Badlands S Dakota, Oligocene, T242Titanothere, Brontothere Upper Tooth, Fossil, Badlands S Dakota, Oligocene, T242 $89.95 Was: Previous Price $99.95
Large Woolly Rhinoceros Fossil Pre-molar tooth Wr5Large Woolly Rhinoceros Fossil Pre-molar tooth Wr5 $69.95 Poebrotherium Lower Teeth, Early Camel Fossil, Badlands South Dakota, P227Poebrotherium Lower Teeth, Early Camel Fossil, Badlands South Dakota, P227 $6.25 Was: Previous Price $6.95
Pleistocene Fossil Bear Tooth from an Extinct Romanian Cave BearPleistocene Fossil Bear Tooth from an Extinct Romanian Cave Bear $75.00 Wooly Woman 453 WolyWomn, New, Free ShippingWooly Woman 453 WolyWomn, New, Free Shipping $7.80
Mammal Cetacea Bone From Aurora Nc Yorktown Formation Fossil Mammal Wb2Mammal Cetacea Bone From Aurora Nc Yorktown Formation Fossil Mammal Wb2 $14.99 New listing
		Fossilized Whale Bones from Alaska ,New listing Fossilized Whale Bones from Alaska , $7.50
Titanothere Small Vertebra, Juvenile, Fossil, Badlands, South Dakota, T293Titanothere Small Vertebra, Juvenile, Fossil, Badlands, South Dakota, T293 $17.95 Was: Previous Price $19.95 New listing
		Florida Fossils turtle scuteNew listing Florida Fossils turtle scute $15.00
Oreodont Partial Upper Skull with Bite Mark, Merycoidodon Badlands S Dakota O886Oreodont Partial Upper Skull with Bite Mark, Merycoidodon Badlands S Dakota O886 $53.95 Was: Previous Price $59.95 New listing
		Florida Fossls Cacite crystal clamNew listing Florida Fossls Cacite crystal clam $20.00
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Horse Tooth Fossil Miniture Three Toed Rare Miocene Bone Valley Florida specimenHorse Tooth Fossil Miniture Three Toed Rare Miocene Bone Valley Florida specimen $39.00 Titanothere Rib Head, Top of Rib, Badlands South Dakota, Oligocene, T295Titanothere Rib Head, Top of Rib, Badlands South Dakota, Oligocene, T295 $17.95 Was: Previous Price $19.95
Fossil Cave Bear phalange foot hand bone European Pleistocene Ursus spelaeusFossil Cave Bear phalange foot hand bone European Pleistocene Ursus spelaeus $26.00 New listing
		Florida Fossils Gator toesNew listing Florida Fossils Gator toes $7.00
Horse jaw bonesHorse jaw bones $48.00 Geological Enterprises Pleistoce fossil Llama tooth Palaeolama mirifica FloridaGeological Enterprises Pleistoce fossil Llama tooth Palaeolama mirifica Florida $11.99
Peccary Lower Teeth, Perchoerus, Pig Fossil, Badlands, South Dakota, Oligo, A221Peccary Lower Teeth, Perchoerus, Pig Fossil, Badlands, South Dakota, Oligo, A221 $35.95 Was: Previous Price $39.95 Marine Ocean Coastal Mammal Ear Bone Florida River Fossils Megalodon DinnerMarine Ocean Coastal Mammal Ear Bone Florida River Fossils Megalodon Dinner $8.93
Large Partial Mammoth Fossil Tooth Fossilized 4 3/4" Ice Age Post Megalodon Mm51Large Partial Mammoth Fossil Tooth Fossilized 4 3/4" Ice Age Post Megalodon Mm51 $49.95 Fossilized dinosaur dungFossilized dinosaur dung $25.00
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Fossil Cave Bear metapodial foot hand Ice Age Ursus spelaeus AustriaFossil Cave Bear metapodial foot hand Ice Age Ursus spelaeus Austria $27.00 New listing
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(F302-21) 2" Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone teeth(F302-21) 2" Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone teeth $29.99 Oreodont teeth in jaw sections - M 1-4 - you choose - White River BadlandsOreodont teeth in jaw sections - M 1-4 - you choose - White River Badlands $5.00
Pair of Titanothere Small Rib Bone Sections, Badlands South Dak, Oligocene, T220Pair of Titanothere Small Rib Bone Sections, Badlands South Dak, Oligocene, T220 $8.95 Was: Previous Price $9.95 Geological Enterprises Miocene fossil tooth, Gavialosuchus americanus, crocodileGeological Enterprises Miocene fossil tooth, Gavialosuchus americanus, crocodile $14.99
Fossil Coprolite Fossil Fish Age Green River Fm Cop036Fossil Coprolite Fossil Fish Age Green River Fm Cop036 $9.99 Fossil Vertebrates Inspectacles,Hplights+Hi Mag,Surf Strap 420specsFossil Vertebrates Inspectacles,Hplights+Hi Mag,Surf Strap 420specs $22.79 Was: Previous Price $23.99
(F302-18) 2-3/8" Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd(F302-18) 2-3/8" Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd $22.99 New listing
		Florida Fossils deer antlerNew listing Florida Fossils deer antler $20.00
Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, T299Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, T299 $26.95 Was: Previous Price $29.95 Hyracodon Upper Tooth, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R500Hyracodon Upper Tooth, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene, R500 $8.95 Was: Previous Price $9.95
Pristine fossil Short Faced Bear claw core Tremarctos Florida Must See!Pristine fossil Short Faced Bear claw core Tremarctos Florida Must See! $49.99 18" Petrified Dinosauer Bone See Pics18" Petrified Dinosauer Bone See Pics $9.99
Fossil Capybara claw core Hydrochaeris holmesi Florida Pleistocene NiceFossil Capybara claw core Hydrochaeris holmesi Florida Pleistocene Nice $60.00 2 Rare Giant Armadillo Scutes - N Sulphur River Texas Tx2 Rare Giant Armadillo Scutes - N Sulphur River Texas Tx $24.95
1.78" Florida Fossil Glyptodont Rosette Body Armor Scute teeth tooth Glyptodon1.78" Florida Fossil Glyptodont Rosette Body Armor Scute teeth tooth Glyptodon $5.85 New listing
		Florida Fossls Taper jaw fragmnet w/ inclusionNew listing Florida Fossls Taper jaw fragmnet w/ inclusion $30.00
Fossil Tooth Unmistakable Display 4 1/2 x 2-3". Pleistocene SiberiaFossil Tooth Unmistakable Display 4 1/2 x 2-3". Pleistocene Siberia $65.00 Fossil Giant Capybara foot bone metapodial Neochoerus Pleistocene FloridaFossil Giant Capybara foot bone metapodial Neochoerus Pleistocene Florida $30.00
Hesperocyon Upper Teeth, Small Early Dog Fossil, South Dakota, Oligocene K259Hesperocyon Upper Teeth, Small Early Dog Fossil, South Dakota, Oligocene K259 $17.95 Was: Previous Price $19.95 (F302-5) Genuine Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd(F302-5) Genuine Fossil Oreodont Merycoidodon Culbertsoni Partial Jaw Bone Sd $14.99
Kansas Bison teethKansas Bison teeth $15.00 Mammal Cereberal CortexMammal Cereberal Cortex $2.95
Hyracodon Partial Upper Tooth, Fossil, Early Rhinoceros, Badlands Sd, R499Hyracodon Partial Upper Tooth, Fossil, Early Rhinoceros, Badlands Sd, R499 $5.35 Was: Previous Price $5.95 Glossy Black Enameled Fossilized Delphinodon Tooth fossil teeth megalodon preyGlossy Black Enameled Fossilized Delphinodon Tooth fossil teeth megalodon prey $12.00
Fossilized Mosasaur Sea Dinosaur Cretaceous Period 90 Million Years Ago, MorrocoFossilized Mosasaur Sea Dinosaur Cretaceous Period 90 Million Years Ago, Morroco $24.00 Equus Complicatus Pleistocene Fossil Horse Tooth Amazing American Horse ToothEquus Complicatus Pleistocene Fossil Horse Tooth Amazing American Horse Tooth $29.95
New listing
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Ultra rare fossil 3-toed Horse tooth Miocene Cormohipparion Florida Color!Ultra rare fossil 3-toed Horse tooth Miocene Cormohipparion Florida Color! $19.99 Hesperocyon Lower Tooth, Small Early Dog Fossil, South Dakota, Oligocene K246Hesperocyon Lower Tooth, Small Early Dog Fossil, South Dakota, Oligocene K246 $8.95 Was: Previous Price $9.95
Fvl#5 - Well Preserved Miocene Era Fossil Vertebrae from Kern County, CaliforniaFvl#5 - Well Preserved Miocene Era Fossil Vertebrae from Kern County, California $49.99 Oreodont Fossil Jaw Bone Teeth From Badlands South Dakota 53 Million Years OldOreodont Fossil Jaw Bone Teeth From Badlands South Dakota 53 Million Years Old $19.99
3 Authentic Horse Teeth Ice Age Teeth Equus Fossil 3 Toed Horse Tooth3 Authentic Horse Teeth Ice Age Teeth Equus Fossil 3 Toed Horse Tooth $29.99 Armadillo Scute Fossil St. Johns River Fossilized Florida Ice Age MammalArmadillo Scute Fossil St. Johns River Fossilized Florida Ice Age Mammal $11.00
Mesohippus Lower Tooth, Three Toed Horse Fossil, Oligocene, South Dakota, H351Mesohippus Lower Tooth, Three Toed Horse Fossil, Oligocene, South Dakota, H351 $5.35 Was: Previous Price $5.95 Woolly Mammoth Hair #23Woolly Mammoth Hair #23 $18.00
Dinosaur Bone Db10Dinosaur Bone Db10 $8.75 Mammoth Partial Tooth Florida Fossils Mammal Jaw Bone Mm31Mammoth Partial Tooth Florida Fossils Mammal Jaw Bone Mm31 $29.95
Bison Tooth ~ Fossil ~ IowaBison Tooth ~ Fossil ~ Iowa $6.99 Tapir Tooth Fossil Fossilized Ice Age Florida Rock canine research mammalTapir Tooth Fossil Fossilized Ice Age Florida Rock canine research mammal $19.00
Geological Enterprises Pleistocene fossil Deer tooth Odicoideus virginianusGeological Enterprises Pleistocene fossil Deer tooth Odicoideus virginianus $12.99 Pair of Associated Titanothere Fossil Vertebrae, Badlands, South Dakota, T309Pair of Associated Titanothere Fossil Vertebrae, Badlands, South Dakota, T309 $53.95 Was: Previous Price $59.95
Beautiful 3" Florida Fossil Fossils Pleistocene Ice Age Equus Horse ToothBeautiful 3" Florida Fossil Fossils Pleistocene Ice Age Equus Horse Tooth $7.95 Beautiful fossil Giant Beaver tooth Castoroides Florida Huge!Beautiful fossil Giant Beaver tooth Castoroides Florida Huge! $14.99
Fossilized Whale Bone with Bear FootprintFossilized Whale Bone with Bear Footprint $3.25 New listing
		Florida Fossils carpal tarsalNew listing Florida Fossils carpal tarsal $20.00
Fossil Giant Capybara metapodial foot bone Neochoerus Pleistocene FloridaFossil Giant Capybara metapodial foot bone Neochoerus Pleistocene Florida $30.00 Nice Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, T302Nice Titanothere Fossil Vertebra, Average Sized, Badlands, South Dakota, T302 $35.95 Was: Previous Price $39.95
Titanothere, Brontothere Fossil, Medium Upper Tooth, Badlands S Dakota, T317Titanothere, Brontothere Fossil, Medium Upper Tooth, Badlands S Dakota, T317 $53.95 Was: Previous Price $59.95 Equus Complicatus Pleistocene Fossil Horse Tooth Exhuberant American Horse ToothEquus Complicatus Pleistocene Fossil Horse Tooth Exhuberant American Horse Tooth $29.95
Fossil Vertebrae Miocene Bakersfield California Sharktooth Hill Kern Co.Fossil Vertebrae Miocene Bakersfield California Sharktooth Hill Kern Co. $35.00 Giant Armadillo Vertebra Fossil Fossilized Holmesina Floridanus Florida mammalGiant Armadillo Vertebra Fossil Fossilized Holmesina Floridanus Florida mammal $37.89
Fossil Horse Tooth Equus Florida River Teeth Ice Age rock fossilized specimenFossil Horse Tooth Equus Florida River Teeth Ice Age rock fossilized specimen $14.93 Hyracodon Chin Section, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene R598Hyracodon Chin Section, Fossil, Early Rhinoceros, Badlands S Dak, Oligocene R598 $8.95 Was: Previous Price $9.95
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