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Reptiles and Birds

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mollusks and annelids


echinoderms and invertabrates

Subphylum Vertabrata



Class Reptilia
   -lizards, snakes, alligators, turtles, dinosaurs
   -entirely terrestrial
   -scaly, dry, thick skin
   -internal skeleton with legs under body 
   -independent of water for reproduction
   -amniotic egg
   -well developed kidneys
   -three chamber heart except for alligators and crocodiles which have a four chamber heart
   -digestion includes a mouth, esophagus, stomach, intestines, anus
   -heat sensitive organs
   -Jacobsons organ, taste the air
 Order Chilonia, turtles, no teeth but a beak
 Order Crocodilia, crocodiles, largest reptile, haven't changed much since evolution
 Order Squimada, snakes and lizards

Class Aves
   -evolution from dinosaurs
   -feathers, modified scales used for flying and insulation
   -wings used for flight
   -skeletal: large sternum, bones are not very solid, no teeth, one ovary
   -have air sacs which aloow a one way flow through lungs
   -four chamber heart
   Endothermic, regulates body temperature. The benefit of this is that they can live anywhere. The costs are energy and evaporative cooling/shivering

  Sensory Organs
 Their vision and avditory are very good, their smell is bad. They have magnetic detection.
  The study of birds is Ornithology