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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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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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Sweet Jet Black Juvenile Horse Cannon Leg Bone Florida Fossil MammalSweet Jet Black Juvenile Horse Cannon Leg Bone Florida Fossil Mammal $31.00 Llama Molar Tooth In Section Of Jaw Florida Fossils Camel Teeth Bones Extinct FlLlama Molar Tooth In Section Of Jaw Florida Fossils Camel Teeth Bones Extinct Fl $25.00
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Mandible of a Small Deer in situ River Terrace Formation MichiganMandible of a Small Deer in situ River Terrace Formation Michigan $19.95 Fossil Mammoth Tooth - 3 x 2 1/2" sectionFossil Mammoth Tooth - 3 x 2 1/2" section $64.99
Geological Enterprises Pleistocene fossil Deer tooth Odocoileus virginianusGeological Enterprises Pleistocene fossil Deer tooth Odocoileus virginianus $13.99 New listing
		Woolly Mammoth Tusk Fragment with Hair - 100% Authentic in a 2x1.5 inch case #40New listing Woolly Mammoth Tusk Fragment with Hair - 100% Authentic in a 2x1.5 inch case #40 $9.99
Sus Scrofa Wild Boar Fossil Lower Jaw With Original Teeth -hog/pig/potbellySus Scrofa Wild Boar Fossil Lower Jaw With Original Teeth -hog/pig/potbelly $40.00 Fossil Giant Armadillo vertebra Holmesina septentrionalis North FloridaFossil Giant Armadillo vertebra Holmesina septentrionalis North Florida $26.00
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Bargain Juvenile Sloth Tooth Florida Fossils Jaw Bones Claw Core Teeth Ice Age @Bargain Juvenile Sloth Tooth Florida Fossils Jaw Bones Claw Core Teeth Ice Age @ $30.00 Turkey Tarsometatarsus With Spur Florida Fossils Fossil Avian Bird Bones Bone FlTurkey Tarsometatarsus With Spur Florida Fossils Fossil Avian Bird Bones Bone Fl $20.00
Fossilized Whale Vertebrae Feeding Scars!Fossilized Whale Vertebrae Feeding Scars! $99.99 Florida Fossil Collection Tooth Teeth Fossils Jaw Bones Camel Tapir Horse BeaverFlorida Fossil Collection Tooth Teeth Fossils Jaw Bones Camel Tapir Horse Beaver $20.00
Camel Bone Specimen from Oregon - FossilCamel Bone Specimen from Oregon - Fossil $6.99 Excellent Giant Armadillo Metapodial Florida Fossils Bones Tooth Teeth SkeletonExcellent Giant Armadillo Metapodial Florida Fossils Bones Tooth Teeth Skeleton $30.00
Partial mammoth (partial) Humorus sub-AdultPartial mammoth (partial) Humorus sub-Adult $100.00 For Your Favorite Fossil Zombie, A Fossil CraniumFor Your Favorite Fossil Zombie, A Fossil Cranium $32.00
Extra Nice Bear Toe Bone Florida Fossil MammalExtra Nice Bear Toe Bone Florida Fossil Mammal $25.00 Fossilized African Small Mosasaur Real Dinosaur Fossil Tooth Morocco, AfricaFossilized African Small Mosasaur Real Dinosaur Fossil Tooth Morocco, Africa $15.00
Fossil Prehistoric Horse Tooth Teeth Mammal Equus 2 7/16" Pair Horse JewelryFossil Prehistoric Horse Tooth Teeth Mammal Equus 2 7/16" Pair Horse Jewelry $19.95 Skull of a Dog, Age Probably EoceneSkull of a Dog, Age Probably Eocene $46.00
Badlands Fossil Collection – Oligocene, 10 PiecesBadlands Fossil Collection – Oligocene, 10 Pieces $70.00 Didelphodon Tooth Large Fully Rooted In Matrix Hell Creek MontanaDidelphodon Tooth Large Fully Rooted In Matrix Hell Creek Montana $69.00
Pliocene porpoise vertebra Yorktown Formation Auror North CarolinaPliocene porpoise vertebra Yorktown Formation Auror North Carolina $7.50 3 High Quality Deer Jaws With Teeth Florida Fossil Mammal Tooth3 High Quality Deer Jaws With Teeth Florida Fossil Mammal Tooth $22.50
Baby 20,000 yr old Steppe Bison Horn from Alaska.9" long.great gift! Cute tooBaby 20,000 yr old Steppe Bison Horn from Alaska.9" long.great gift! Cute too $70.00 Fossil Whale vertebra Pliocene Florida cetaceanFossil Whale vertebra Pliocene Florida cetacean $17.00
Mesohippus Upper Tooth, Three Toed Horse Fossil, Oligocene, South Dakota, H400Mesohippus Upper Tooth, Three Toed Horse Fossil, Oligocene, South Dakota, H400 $6.95 Real Woolly Mammoth hair in a keychain!Real Woolly Mammoth hair in a keychain! $10.00
Spermwhale Tooth 3+ Inch (Phystarula) Lee Creek / Texas Gulf / Pcs AuroraSpermwhale Tooth 3+ Inch (Phystarula) Lee Creek / Texas Gulf / Pcs Aurora $15.00 mastodon bonemastodon bone $100.00
#3 Ice Age Pleistocene Fossil Camel Astragulus From Texas Coastal Area.#3 Ice Age Pleistocene Fossil Camel Astragulus From Texas Coastal Area. $9.99 ancient? Fossilized ?Vertebrae? Bone fossilancient? Fossilized ?Vertebrae? Bone fossil $29.99
Very Large Ground Sloth ClawVery Large Ground Sloth Claw $55.00 2 Excellent Camel Teeth Florida Fossil Mammal Tooth2 Excellent Camel Teeth Florida Fossil Mammal Tooth $25.00
Geological Enterprises Oligocene fossil Miniochoerus gracilis toothGeological Enterprises Oligocene fossil Miniochoerus gracilis tooth $18.99 Unprepped Titanothere Jaw Section, Brontothere Fossil, Badlands, S Dakota, T371Unprepped Titanothere Jaw Section, Brontothere Fossil, Badlands, S Dakota, T371 $64.95
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Rare Lesser Giant Armadillo Flex Scute Florida Fossils Osteoderm Bones Tooth FlRare Lesser Giant Armadillo Flex Scute Florida Fossils Osteoderm Bones Tooth Fl $20.00 American Cheet
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Ah Canine Cast * Replica * Florida Fossils Saber Cat Tooth LionAmerican Cheet 00003296 Ah Canine Cast * Replica * Florida Fossils Saber Cat Tooth Lion $27.00
Fossil tooth mammalFossil tooth mammal $39.99 Pair of nice Glyptotherium Arizonae horned tail scutes. Lot #14.Pair of nice Glyptotherium Arizonae horned tail scutes. Lot #14. $19.99
Super Colorful Mastodon Tooth Partial Florida Fossil Mammal TeethSuper Colorful Mastodon Tooth Partial Florida Fossil Mammal Teeth $15.51 Large Fossil Whale Bone Vertebra Dredged from the North SeaLarge Fossil Whale Bone Vertebra Dredged from the North Sea $54.00 Was:  Previous Price $60.00
Poebrotherium Upper Section, Early Camel Fossil, Badlands South Dakota, P198Poebrotherium Upper Section, Early Camel Fossil, Badlands South Dakota, P198 $10.95 Florida Fossil Camel/ Lama CanineFlorida Fossil Camel/ Lama Canine $25.00
Mammoth Vertebrate FossilMammoth Vertebrate Fossil $20.00 Subhyracodon Jaw Section, Large Rhinoceros Fossil, South Dakota, Oligocene, R666Subhyracodon Jaw Section, Large Rhinoceros Fossil, South Dakota, Oligocene, R666 $39.95
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Hyracodon partial teeth collection - Brule formation, Nebraska fossilsHyracodon partial teeth collection - Brule formation, Nebraska fossils $35.00 Titanothere, Brontothere Fossil, Small Upper Tooth, Badlands S Dakota, T327Titanothere, Brontothere Fossil, Small Upper Tooth, Badlands S Dakota, T327 $59.95
Nice pair of Glyptotherium Arizonae carapace edge scutes. Lot #11Nice pair of Glyptotherium Arizonae carapace edge scutes. Lot #11 $17.99 Sweet Ultra Glossy Dire Wolf Tooth Florida Fossil Mammal TeethSweet Ultra Glossy Dire Wolf Tooth Florida Fossil Mammal Teeth $9.99
Fossil Dinosaur Bone - Allosaurus, Morrison Formation, ColoradoFossil Dinosaur Bone - Allosaurus, Morrison Formation, Colorado $50.00 3 Monster Mammal Teeth Deep South Ga Fl Fossil ~90~3 Monster Mammal Teeth Deep South Ga Fl Fossil ~90~ $13.00
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Early Deer, Leptomeryx evansi, Fossils, 2 Jaw Sections, Badlands, S Dakota, D274Early Deer, Leptomeryx evansi, Fossils, 2 Jaw Sections, Badlands, S Dakota, D274 $6.95 Nice Mastodon Astragalus Florida Fossil Mammal BoneNice Mastodon Astragalus Florida Fossil Mammal Bone $25.00
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		Fossilized Woolly Mammoth Tusk Fragment 100% Authentic - stock #45New listing Fossilized Woolly Mammoth Tusk Fragment 100% Authentic - stock #45 $3.99 Gorgeous Short Faced Bear Molar Tooth Florida Fossils Teeth Canine Skull Bones @Gorgeous Short Faced Bear Molar Tooth Florida Fossils Teeth Canine Skull Bones @ $69.00
Fossils-Two Rabbit Calcaniums-2!-Rare! Fl. River!Fossils-Two Rabbit Calcaniums-2!-Rare! Fl. River! $12.99 Mammoth Tooth Fossil, 1.6lbs.Mammoth Tooth Fossil, 1.6lbs. $69.00
Early Deer, Leptomeryx evansi, Fossil, Jaw Section, Badlands, S Dakota, D266Early Deer, Leptomeryx evansi, Fossil, Jaw Section, Badlands, S Dakota, D266 $6.95 Genuine Woolly Mammoth Bone Discovered In Siberia RussiaGenuine Woolly Mammoth Bone Discovered In Siberia Russia $45.00
Rare Miocene Camelid Canine Tooth Florida Fossils Teeth Jaw Bones Llama Fl @Rare Miocene Camelid Canine Tooth Florida Fossils Teeth Jaw Bones Llama Fl @ $69.00 Unprepared Oreodont Fossil - Front of Skull w/Eye Socket 30 Myo #14269 60oUnprepared Oreodont Fossil - Front of Skull w/Eye Socket 30 Myo #14269 60o $99.99
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Gomphothere Mastodon Tooth Florida Fossils Teeth Jaw Bones Skull FlGomphothere Mastodon Tooth Florida Fossils Teeth Jaw Bones Skull Fl $25.00 The Mammoth The Mammoth Hunting In Northeast Siberia Basset Digby 1926 Appleton.The Mammoth The Mammoth Hunting In Northeast Siberia Basset Digby 1926 Appleton. $69.99
Deluxe Multicolored Juvenile Mastodon Tooth Partial Florida Fossil Mammal TeethDeluxe Multicolored Juvenile Mastodon Tooth Partial Florida Fossil Mammal Teeth $67.00 Fossil Whale cervical vertebra Miocene Bakersfield cetaceanFossil Whale cervical vertebra Miocene Bakersfield cetacean $16.00
#1 Ice Age Pleistocene Fossil Camelops Leg Bone From Texas Coastal Area.#1 Ice Age Pleistocene Fossil Camelops Leg Bone From Texas Coastal Area. $15.00 Large Fossilized Whale Vertebrae possibly Florida - FossilLarge Fossilized Whale Vertebrae possibly Florida - Fossil $99.99
Fossilized Whale Ear Bone~4" Long, 236 Grams~#5Fossilized Whale Ear Bone~4" Long, 236 Grams~#5 $19.99 Giant Sloth Claw w/ stdGiant Sloth Claw w/ std $77.05
Nice Upper Peccary Canine Tooth Florida Fossils Jaw Bones Pig Skeleton Skull Fl
00004000Nice Upper Peccary Canine Tooth Florida Fossils Jaw Bones Pig Skeleton Skull Fl 00004000 $45.00 Geological Enterprises Pleistoce fossil gator tooth Alligator mississippiensisGeological Enterprises Pleistoce fossil gator tooth Alligator mississippiensis $12.99
Bargain Sloth Tooth Florida Fossils Teeth Jaw Bones Claw Core Ice Age Skeleton @Bargain Sloth Tooth Florida Fossils Teeth Jaw Bones Claw Core Ice Age Skeleton @ $30.00 Buffalo Fossilized Skull (partial) BisonBuffalo Fossilized Skull (partial) Bison $80.00
Fossil Mammoth RibFossil Mammoth Rib $30.00 Stellar Big Duck Or Goose Bird Bone Florida Fossil Mammal

00006000Stellar Big Duck Or Goose Bird Bone Florida Fossil Mammal 00006000 $20.00
Poebrotherium Lower Tooth, Early Camel Fossil, Badlands South Dakota, P276Poebrotherium Lower Tooth, Early Camel Fossil, Badlands South Dakota, P276 $6.95 Extra Extra Thick Glyptodont Body Armor Scute Florida Fossil ice age teeth toothExtra Extra Thick Glyptodont Body Armor Scute Florida Fossil ice age teeth tooth $38.00
Unique Llama Jaw Bone W/ Canine Tooth Florida Fossils Camel Ice Age Extinct Fl @Unique Llama Jaw Bone W/ Canine Tooth Florida Fossils Camel Ice Age Extinct Fl @ $45.00 Rare Giant Beaver Astragalus Ankle Bone Florida Fossils Fossil Rodent Tooth JawRare Giant Beaver Astragalus Ankle Bone Florida Fossils Fossil Rodent Tooth Jaw $30.00
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