mammalian adaptations
DESCRIPTION
Mammalian Adaptations. MONOTREMES “Egg laying”. Duckbilled Platypus Anteater Echidna. MARSUPIALS Premature babies develop in pouch. Found in Austrailia/ New Guinea Kangaroo Wallaby. MARSUPIALS. Only North American Marsupial Oppossum. - PowerPoint PPT PresentationTRANSCRIPT
Mammalian Adaptations
MONOTREMES“Egg laying”
Duckbilled PlatypusAnteaterEchidna
MARSUPIALSPremature babies develop in pouch
Found in Austrailia/ New Guinea
• Kangaroo
• Wallaby
MARSUPIALSOnly North American Marsupial
• Oppossum
PLACENTALEmbryos nourished inside mother by
placenta
95% of all mammals are placental
At least 18 orders
Incisors- Chisel like teeth for cutting
Canines- Pointed teeth for puncturing/tearing
Premolars- Shred and grind
Molars- Flat teeth for grinding, crushing
TEETH
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
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
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
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!
PINNIPEDSCarnivorous
streamlined body
flipper limbed
Seals WalrusesSea lions
UNGULATESMammals with Hooves
CETACEANSIncludes:
whales, dolphins,
porpoises
CHIROPTERA
BATS
Only mammals that can fly