mammalian adaptations. monotremes “egg laying” duckbilled platypus anteater echidna
TRANSCRIPT
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Mammalian Adaptations
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MONOTREMES“Egg laying”
Duckbilled PlatypusAnteaterEchidna
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MARSUPIALSPremature babies develop in pouch
Found in Australia/ New Guinea
• Kangaroo
• Wallaby
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MARSUPIALSOnly North American Marsupial
• Oppossum
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PLACENTALEmbryos nourished inside mother by
placenta
95% of all mammals are placental
At least 18 orders
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Incisors- Chisel like teeth for cutting
Canines- Pointed teeth for puncturing/tearing
Premolars- Shred and grind
Molars- Flat teeth for grinding, crushing
TEETH
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Specialized teeth vary with diet
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Grass eaters have different teeth than carnivores
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SALIVARY GLANDS
• DIGESTION starts in the MOUTH
Image from: http://www.entnet.org/healthinfo/throat/salivary.cfm
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BALEENThin 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
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ECHOLOCATIONBats can fly without eyes, but NOT
without ears
Bats emit high frequency sound waves that bounce off objects
Can determine size, distance, direction, speed
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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
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CECUM
In non cud chewers like horses, rabbits, rodents, elephants
Small pouch off small intestine containing bacteria to digest plants
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Human appendix is vestigial cecum
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PRIMATES Larger Brain
Grasping hand with fingernails instead of claws
2 forward facing eyes
Includes:•Gorillas•Monkeys•Lemurs
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PRIMATES
Humans are primates too!
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PINNIPEDSCarnivorous
streamlined body
flipper limbed
Seals WalrusesSea lions
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UNGULATESMammals with Hooves
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CETACEANSIncludes:
whales, dolphins,
porpoises
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CHIROPTERA
BATS
Only mammals that can fly