Class Mammalia General Characteristics Bilaterally symmetrical Mammary glands
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
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