2 Classification Kingdom: Animalia Phylum: Chordata Subphylum: VertebratesClass:MammaliaVery diverse classLive on every continent & in every ocean3 subclasses:MonotremesMarsupialsPlacental mammals19 different orders4400 Species
3 Key Mammalian Characteristics 1. Endothermic:Warm-bloodedCan live in any climateRegulate internal temperatureVERY ACTIVEAble to perform strenuous activities for long periods of time.High metabolismsRequire a lot of food
4 Use hair/fur and a layer of subcutaneous fat to conserve heat/ prevent heat lose.
5 Uses sweat glands, panting, or shedding to cool down their bodies. Recipe for sweat:Excess heat, water and salt.
6 2. Hair/Fur Lanugo Marine mammals have a small amount of hair. InsulationCamouflageProtectionWaterproofingMarine mammals have a small amount of hair.Lanugo
8 3. Completely divided 4 chambered heart. Has a complete septumVery efficient heart b/c clean & dirty blood never mix
9 Milk production - presence of mammary glands - which are modified sweat glandsused by the female to feed youngKnown as teats(provide milk from mammary glands)
10 Milk production Milk contains: Protein Sugars Vitamins Fat Calcium (sm. amt.)Water
11 5.Single Jawbone-the lower jawbone in a mammal is single bone whereas in other vertebrates the lower jaw is made up of 2 or more bones.
12 6. Specialized TeethTeeth in mammals are modified for different functionsBack teeth in general are for: chewing, grinding, crushing, slicingMolars: grind, crush, or cut foodPre-molars: shear, shred or grind food
13 Teeth are the 1st place physical digestion occurs. Front Teeth: in general are used for biting, cutting, seizing preyCanines: grip & puncture preyIncisors: used to cutTeeth are the 1st place physical digestion occurs.
14 Teeth and SkullDid you know that bone is 5X stronger than steel?
15 Using teeth to identify: The number, type and size of the teeth vary according to the specific type of mammal and what it eats.
16 History of Mammals-Mammals first appeared on Earth at the same time as dinosaurs.-Dinosaurs and mammals competed for food-Dinosaurs were larger and thus more successful at finding food so dinosaurs were much larger in size.
17 -mammals where only the size of a small rodents.-once dinosaurs went extinct the mammals flourished and grew larger in size and are now the most prominent organisms on Earth.
18 Three main groups of Mammals MonotremesMarsupialsPlacentalsWhich are we????????????????
19 Monotremes Oviparity Live in New Guinea and Australia Examples: Egg layerslay 1-2 leathery eggs per yearfeeds off yolk of eggmammary glandsLive in New Guinea and AustraliaExamples:Duckbill platypusSpiny anteater
20 Marsupials 280 species of marsupials/pouched mammals Viviparity Ex. Opossum (live in US), kangaroo, koalaViviparityGive birth to live youngDevelop in uterus(sm period of time)Under-developed young crawl out of vagina into pouch where they feed off teats
22 Placental 19 orders of placental animals Viviparity Give birth to live young-uterus, placenta, umbilical cord (provides nourishment to fetus from mother)Gestation period (time it takes for full fetal development) varies with different placentals.Cared for by parentsFed w/ mammary glands until old enough to feed on own