6.4. BIRDS

6.4. BIRDS

1. WHAT ARE BIRDS LIKE?

   • They are terrestrial vertebrates and most of them can fly.
   • They are ENDOTHERMIC
   • They have AERODYNAMIC body
   • They have HOLLOW bones that make birds lighter and help them fly.
   • Their skin are covered in FEATHERS. Some are used for flying and others for preserve body heat.
   • They have 4 LIMBS: 2 hindlimbs are SCALY legs with 4 toes, and 2 forelimbs are WINGS
   • Their mandibles form a BEAK that have different sahpes depending on the food that they need to live.
   • They breathe with LUNGS and have air sacs which ensure birds have enough oxygen whn they are flying..

2. VITAL FUNCTIONS

   • NUTRITION
     • Some are carnivores (insects, vertebrates,...), some are hervivores (plants, fruit,seeds,...)
   • REPRODUCTION
     • They reproduce sexually and are oviparous and lay eggs with an impermeable shell
     • They build NESTS and incubate them to keep warm.

3. TYPES

   • CARINATES (parrots, penguins, stork, eagle, seagull...)
     • Most of birds are carinate
     • Most of them can fly (exception penguins, hen,...)
     • Thay have a KEEL in their sternum that support the powerfull muscles tha move the wings and enable birds to fly.
   • RATITES (ostrich, cassowary, rhea, emu and kiwi)
     • Thay are large birds
     • They do not fly and have no keel, and their wings are atrophied.

Imágenes y archivos del mapa

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• Birds | Educational Video for Kids (Enclavar)