Class mammalia - "breasted" animals

Class mammalia breasted animals Mammalogy study of mammals

Traits Mammary glands produce milk

Traits Hair (or fur) Traits

4 chambered heart Traits endotherms

Traits Diaphragm

Traits Heterodonts different teeth Traits

7 neck vertebrae Traits Viviparous live birth

Traits External fleshy ear lobes

Traits Well developed brain Advantages of mammals

Temperature regulation Allows mammals to be active at any time, fur and fat keep heat in, sweat, panting, and ears

cool them off Intelligence Smartest animals, can learn from experience

Respiration Good lungs, diaphragm can move air in and out more efficiently

Care for young Provide milk, teach young how to get food and escape predators

Classification Based on teeth, limbs, and reproduction

Teeth Heterodonts have different kinds of teeth to eat different things

Canines Fangs for tearing (usually meat) Molars

Chewing and grinding Incissors front teeth for biting things off

Limbs Vary greatly within the class depending on their use

Reproduction 1st consideration in classifying

Monotremes Marsupials

Placentals Gestation Period of time the embryo is in the uterus

receiving nutrients from the mother Monotremes one opening cloaca egg laying mammals,

no gestation E.g. platypus, echidna Platypus

Echidna (spiny anteater) Short beak Echidna

Long beak Echidna Marsupials

Pouch mammals, brief gestation, born very immature and then develop in a pouch E.g. kangaroo, koala, opossum

Placentals (95% of mammals), long gestation, born better developed Humans, dogs, deer

Orders of Placental Mammals Insectivora

Lagomorphia Cetacea

Chiroptera Carnivora

Proboscidea Edentata

Pinnipedia Ungulates

Rodentia Sirenia

Primates Insectivora insect eaters most primitive placentals

E.g. shrews, moles Star-nosed mole

Chiroptera hand wings only flying mammals E.g. - bats

Vampire bats Flying foxes worlds largest bats

5 foot wingspan Edentata no teeth reduced teeth, large claws

E.g. anteaters, sloths, armadillos Anteater skull

Rodentia gnawing teeth 2 pairs of continuously growing gnawing incisors, largest order of mammals

E.g. beaver, ground hog, mice, rats Hard foods file the teeth down what would happen if they ate only soft foods?

Naked mole rat Lagomorpha

4 pairs of gnawing incisors, jumping hind legs E.g. rabbits, hares, pika Rather than chew the cud

Reinjest their own droppings to get the most nutrients from their food Carnivora

meat eaters prominent canines, claws E.g. cats, dogs, bears Pinnipedia

feather foot carnivores, amphibious, have flippers E.g. seals, walruses

Fighting Walruses Sirenia temptress aquatic, flippers, fluke,

herbivores, blubber E.g. manatees Protected

Cetacea Aquatic, flippers, fluke, blubber, blowhole, high intelligence (whales and dolphins)

Toothed whales killer whales Baleen whales gray whales

Blowhole Blue whale largest animal to live on Earth, 100 ft. and 250

tons Proboscidea nose have a trunk and tusks, largest living

land animal E.g. - elephants Ungulates

hoofed mammals modified claws for running on hard ground Artiodactyla

even number of toes E.g. cows, goats, deer, camels, giraffes Rumen

A specialized region of the digestive tract allowing more efficient digestion of plant matter

Microbes ferment the plant matter and allow it to be digested

Perissodactyla odd number of toes or hoof E.g. horse, donkey, zebra, rhino

Primates 1st grasping thumb, high intelligence, upright posture, binocular vision E.g. humans, chimps, orangutans

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