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Bird Characteristics (Bird Eggs (Incubate Both parents keep them warm…

- - - - Lightweight
      - Strong
    - - Stability for flight
      - Provides strength
    - - Strengthen bones without adding much weight
    - - Supports the chest muscles needed for flight
    - - Support the Tail Feathers
        
        Steering
        
        Balance
        
        flighting
        
        Landing
  - - - insulating layer
        
        Adults
        Next to the skin
        
        Young Birds
        Entire body
    - - Connects the feathers to the skin
      - Microscopic pit
    - - barbules
        branches in a branch
      - For Strength
    - - bird rubs oil from gland above the base of the tail over feathers
      - uses beak or bill
      - makes water repellent
      - conditions
    - - outside
      - Used for flying
  - - - not all birds fly
        
        used to swim (penguins)
        
        maintain balance running & walking
        
        Courtship
    - - thrust to go forward
      - Lift to stay in the air
    - - curved on tops
      - Humans copied shape for planes
    - - Air moves slower across the bottom
        Slow moving air = greater air pressure.
        
        Creates Lift (Up)
        Amount of lif depends on
        
        Wing Total surface area
        
        Speed of air over wing
        
        Angle of the wing
  - - - Body Heat
        energy from food + Oxygen
      - Powers flight muscles
      - convert food to energy
    - - Connect to balloon like sacs all over body
      - Inhale & Exhale Air goes from lungs into sacs
        
        Constant supply of air for flight muscles
  - - - 4 chambers
        
        large compared to body
        
        Keeps oxygen filled blood separate from carbon dioxide filled blood
        
        Beats rapidly