class mammalia
DESCRIPTION
Class Mammalia. Mammals. C haracteristics. Fur or hair Sweat glands Mammary glands (females) Most important mammalian characteristic Diaphragm for breathing Use various combinations of fur, hair and subcutaneous fat to conserve body heat. Three main categories 1: Placentals. - PowerPoint PPT PresentationTRANSCRIPT
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Class MammaliaMammals
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CharacteristicsFur or hairSweat glandsMammary glands (females)
Most important mammalian characteristic
Diaphragm for breathingUse various combinations of fur, hair and
subcutaneous fat to conserve body heat
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Three main categories1: Placentals
The young develop inside female uterus attached to a placenta = largest group
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Three main categories2: Marsupials
Young are tiny an underdeveloped; they crawl to the female pouch, attach to a nipple an finish development there
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Three main categories3: Monotremes
The young develop inside of eggs (similar to reptile eggs)
Most primitive group, 3 species left(platypus and 2 kinds of echidna)
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Adaptations for movementLand
Well developed muscles and boneSkeleton is also highly flexibleLimb structure permits ease of motion
and speedCat family: has grasping claws for
climbing and holding preySnowshoe hair: elongated hind limbs for
hopping in the snowGrazing animals have modified toes to
help with speed
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FlightOnly batsHave membrane between bones of
wings
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WaterWhales, dolphins and porpoisesFront limbs have become flippersTail propels through waterStreamlined body allows for speed Blowhole instead of mouthOtters and seals have similar
adaptations but no blowhole
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Digestive system:ruminants (cow, moose, deer,
camels)4 chambered stomachFirst two chambers for bacterial fermentationFood regurgitated for more mechanical
breakdown before entering last two chambersLast two chambers for chemical digestionThis is necessary because they live off of grass
which is hard to fully digest