Class Mammalia.

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Presentation transcript:

Class Mammalia

General Characteristics Bilaterally symmetrical __________ Mammary glands (produces milk) Nurse young Endothermic (warm blooded) ____________________ Dioecious Internal fertilization

Heterodont dentition Specialized teeth ______________________ Produce a placenta (usually)

________________________ 6 Major Orders: 1.) Order Rodentia 2.) Order Artiodactyla 3.) Order Carnivora 4.) Order Cetacea 5.) Order Primates 6.) Order Monotremata

Order Rodentia Rodents! Mice, squirrels, gophers, beavers, & guinea pigs ________________ Have continuously growing incisors ____________ = front teeth Must chew to keep short

Have a short breeding cycle _____________________

Order Artiodactyla Pigs, hippos, camels, deer, sheep, etc. 220 species _______________

Mostly herbivorous/grazing animals _______________________ Are omnivorous

Order Carnivora ________________________! Canines, cats, bears, raccoons, seals, otters, walruses, etc. 260 species Are predatory

__________________________ Have special teeth and/or claws to take down prey

Order Cetacea Whales and dolphins Have blubber for insulation ______________________ All aquatic Highly intelligent

Use sonar to locate food

Order Primates Gorillas, chimps, orangutans, humans, monkeys, lemurs _______________ Adaptations for tree-living Strong limbs with opposable digits

___________________ Extensive parental care

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

Order Monotremata Poison Barb Echindas