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Download Mammalian Adaptations - local.brookings.k12.sd.us
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Mammalian Adaptations MONOTREMES “Egg laying” Duckbilled Platypus Anteater Echidna MARSUPIALS Premature babies develop in pouch Found in Australia/ New Guinea • Kangaroo • Wallaby MARSUPIALS Only North American Marsupial • Oppossum PLACENTAL Embryos nourished inside mother by placenta 95% of all mammals are placental At least 18 orders TEETH Incisors- Chisel like teeth for cutting Canines- Pointed teeth for puncturing/tearing Premolars- Shred and grind Molars- Flat teeth for grinding, crushing Specialized teeth vary with diet Grass eaters have different teeth than carnivores SALIVARY GLANDS • DIGESTION starts in the MOUTH Image from: http://www.entnet.org/healthinfo/throat/salivary.cfm BALEEN Thin keratin plates that hang from the roof of the mouth and screen food from water Image from: http://home.iprimus.com.au/readman/whale.htm ECHOLOCATION Bats can fly without eyes, but NOT without ears Bats emit high frequency sound waves that bounce off objects Can determine size, distance, direction, speed RUMEN In cud chewers like cows, sheep, goats, giraffes First chamber of stomach containing bacteria to digest plants Image from: http://arbl.cvmbs.colostate.edu/hbooks/pathphys/digestion/herbivores/rumen_anat.html CECUM In non cud chewers like horses, rabbits, rodents, elephants Small pouch off small intestine containing bacteria to digest plants Human appendix is vestigial cecum PRIMATES Larger Brain Grasping hand with fingernails instead of claws 2 forward facing eyes Includes: •Gorillas •Monkeys •Lemurs PRIMATES Humans are primates too! PINNIPEDS Carnivorous streamlined body flipper limbed Seals Walruses Sea lions UNGULATES Mammals with Hooves CETACEANS Includes: whales, dolphins, porpoises CHIROPTERA BATS Only mammals that can fly
