Class Mammalia

1. Class Mammalia

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

3. Heterodont dentition • Specialized teeth • ______________________ • Produce a placenta (usually)

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

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

6. Have a short breeding cycle • _____________________

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

8. Mostly herbivorous/grazing animals • _______________________ • Are omnivorous

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

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

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

12. Use sonar to locate food

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

14. ___________________ • Extensive parental care

15. 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

16. Order Monotremata Poison Barb Echindas