BIRDS

BIRDS

1. TYPES

   • CARINATES
     • THEY ARE THE MAJORITY OF BIRDS AND CAN FLY
       • THE STERNUM (THE BREASTBONE IN THE THORAX THAT PROTECTS THE HEART FROM THE LUNGS ) IS VERY WIDE
         • ITS KEEL( THE STRUCTURE FORMED BY THE STERNUM) CAN SUPPORT POWERFUL MUSCLES THAT MOVE WINGS
   • RATITES
     • THEY ARE ONLY A FEW, GENERALLY LARGE, FLIGHTLESS BIRDS.
       • THEY HAVE NO KEEL

2. VITAL FUNCTIONS

   • REPRODUCTION
     • THEY REPRODUCE SEXUALLY AND ARE OVIPAROUS
   • NUTRITION
     • THEY ARE HETEROTROPHIC AND SOME OF THEM ARE CARNIVORES WHILE OTHER HERBIVORES

3. WHAT ARE BIRDS?

   • BIRDS ARE TERRESTIAL VERTEBRATES AND MOST OF THEM CAN FLY

4. CHARACTERISTICS

   • THEY HAVE AERODINAMIC BODY, WHAT MEANS THAT THEY HAVE SOME CHARACTERISTICS THET LET THEM FLY
     • THEY ARE COVERED WITH FEATHERS
       • THEIR MANDIBLES HAVE NO TEETH AND FORM A BEAK
         • THEY BREATHE WITH LUNGS
           • THEY ENDOTHERMIC, THAT MEANS THEY MANTAIN THEIR BODY TEMPERATURE