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Class Mammalia
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General Characteristics
Bilaterally symmetrical __________ Mammary glands (produces milk) Nurse young Endothermic (warm blooded) ____________________ Dioecious Internal fertilization
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Heterodont dentition Specialized teeth ______________________ Produce a placenta (usually)
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________________________
6 Major Orders: 1.) Order Rodentia 2.) Order Artiodactyla 3.) Order Carnivora 4.) Order Cetacea 5.) Order Primates 6.) Order Monotremata
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Order Rodentia Rodents!
Mice, squirrels, gophers, beavers, & guinea pigs ________________ Have continuously growing incisors ____________ = front teeth Must chew to keep short
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Have a short breeding cycle
_____________________
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Order Artiodactyla Pigs, hippos, camels, deer, sheep, etc. 220 species _______________
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Mostly herbivorous/grazing animals _______________________
Are omnivorous
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Order Carnivora ________________________! Canines, cats, bears, raccoons, seals, otters, walruses, etc. 260 species Are predatory
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__________________________
Have special teeth and/or claws to take down prey
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Order Cetacea Whales and dolphins Have blubber for insulation ______________________ All aquatic Highly intelligent
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Use sonar to locate food
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Order Primates Gorillas, chimps, orangutans, humans, monkeys, lemurs _______________ Adaptations for tree-living Strong limbs with opposable digits
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___________________ Extensive parental care
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Order Monotremata Duck Billed Platypus and Echidnas (spiny anteater)
Only mammals to lay eggs Have a single opening called a cloaca for urination, defecation, and reproductive Platypus has a poisonous barb on the back foot
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Order Monotremata Poison Barb Echindas
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