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