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Contents contributed and discussions participated by garzat5774

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Nature vs Nurture: How do baby birds learn how to fly? | Bio-Aerial Locomotion - 1 views

blogs.bu.edu/...do-baby-birds-learn-how-to-fly birds
shared by garzat5774 on 03 Dec 14 - No Cached
    • garzat5774
      garzat5774 on 03 Dec 14
       
      birds learn to fly with practice but it is a natural instinct like how hummans learn to walk and talk, bird parent help them by pushing them out of the nest and for them to try to fly.
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How birds fly | Sciencelearn Hub - 0 views

sciencelearn.org.nz/...How-birds-fly birds
shared by garzat5774 on 03 Dec 14 - No Cached
  • Flying birds have: lightweight, smooth feathers – this reduces the forces of weight and drag a beak, instead of heavy, bony jaws and teeth – this reduces the force of weight an enlarged breastbone called a sternum for flight muscle attachment – this helps with the force of thrust light bones – a bird’s bones are basically hollow with air sacs and thin, tiny cross pieces to make bones stronger – this reduces the force of weight a rigid skeleton to provide firm attachments for powerful flight muscles – this helps with the force of thrust a streamlined body – this helps reduce the force of drag wings – these enable the force of lift.
  • WingsThe shape of a bird’s wing is important for producing lift. The increased speed over a curved, larger wing area creates a longer path of air. This means the air is moving more quickly over the top surface of the wing, reducing air pressure on the top of the wing and creating lift. Also, the angle of the wing (tilted) deflects air downwards, causing a reaction force in the opposite direction and creating lift.Larger wings produce greater lift than smaller wings. So smaller-winged birds (and planes) need to fly faster to maintain the same lift as those with larger wings.Wing loading tells you how fast a bird or plane must fly to be able to maintain lift: wing loading = weight/wing area (kilograms per square metre).A smaller wing loading number means the bird/plane can fly more slowly while still maintaining lift and is more manoeuvrable.
  • GlidingWhen a bird is gliding, it doesn’t have to do any work. The wings are held out to the side of the body and do not flap. As the wings move through the air, they are held at a slight angle, which deflects the air downwards and causes a reaction in the opposite direction, which is lift. But there is also drag (air resistance) on the bird’s body, so every now and then, the bird has to tilt forward and go into a slight dive so that it can maintain forward speed.
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  • SoaringSoaring flight is a special kind of glide in which the bird flies in a rising air current (called a thermal). Because the air is rising, the bird can maintain its height relative to the ground. The albatross uses this type of soaring to support its multi-year voyages at sea.
  • FlappingBirds’ wings flap with an up-and-down motion. This propels them forward. The entire wingspan has to be at the right angle of attack, which means the wings have to twist (and do so automatically) with each downward stroke to keep aligned with the direction of travel.
  • Birds obtain thrust by using their strong muscles and flapping their wings. Some birds may use gravity (for example, jumping from a tree) to give them forward thrust for flight. Others may use a running take-off from the ground.
  • Different birds have different adaptive features to meet their flight needs: Some birds are small and can manipulate their wings and tail to manoeuvre easily, such as the fantail (pīwakawaka). The hawk, with its large wingspan, is capable of speed and soaring. Gannets and seabirds are streamlined to dive at high speeds into the ocean for fish. Godwits, although small, are equipped to fly long distances.
    • garzat5774
      garzat5774 on 03 Dec 14
       
      birds have some chacteristics that help them fly, birds are light weighted they have light feathers insted of heavy ones that add more weight to their bodys, they also have a beak insted of jaws that also add weight to their boddys, thay have hollow bones in their body that means that the bone has nothing inside it
    • garzat5774
      garzat5774 on 03 Dec 14
       
      birds get ready to fly by flapping their wings, some birds use "gravity" to take of some run and they jump just like an airplane and others jump from a tree and then start flapping their winds
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Francis Drake - Biography - - Biography.com - 0 views

www.biography.com/...francis-drake-9278809 sir francis drake biography
shared by garzat5774 on 24 Nov 14 - No Cached
  • born around 1540-1544
  • in Devonshire, England,
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all about hair - Google Search - 0 views

www.google.com.mx/search
shared by garzat5774 on 07 Nov 14 - No Cached
    • garzat5774
      garzat5774 on 07 Nov 14
       
      the outer layer of the hair is called the cuticle the cuticle protects the hair and it is transparent. The Middle hair is called the cortex and it has natural pigment wich defines your hair color. and the inner part of the hair is called the mdulla.
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BrainPOP | Hair - 1 views

www.brainpop.com/...hair brainpop hair
shared by garzat5774 on 05 Nov 14 - No Cached
    • garzat5774
      garzat5774 on 05 Nov 14
       
      All mammals have hair in there body because they need to keep themselves warm when it's cold, we are warm blooded as the rest of the mammals. all mammels have hair exept the water mammels like whales and dolphins but they keep warm there bodies by eatins a lot of amilals and get layers of fat that will keep them warm, but etherway they have at least a little bit of hair one point during there lives. 
    • garzat5774
      garzat5774 on 05 Nov 14
       
      Hummans have hair in almost every part of our body, some places that don't include our lips, the palms of your hand and the souls of your feet. But our hair is different in each part of your body. One type of hair is the lauguno hair, wish is the hair babies are covered with.Another type of hair is the vellus hair wish is the hair moat of your body is covered with, those hair is the one in your legs and arms and mesures less than 1 inch,And the 3rd type is the terminal hair wish is longer than an inch and grows in the top of your head and other places.
    • garzat5774
      garzat5774 on 05 Nov 14
       
      how doe your hair grow? first before you are born tiny foccils are formed inside your skin, foccils are like roots but for hair. you have a ton of focills you have 100,000 yust in your head alone. AT the bottom of each foccils you have thousands of cells with are dividing each second , as they divide and are craetedb the old ones are pushed out and out of you head this makes hair
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    • garzat5774
      garzat5774 on 05 Nov 14
       
      each hair has 2 or 3 diffrent types of layers the outermost layer is called the cuticle wich protects the rest of the hair. the middle hair is called the cortex, and the center of the hair is caled meddul, you only have medulla in your terminal hair and if you are a natural blande you dont have any meddula at all.
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How fast does hair grow - Hair growth cycle - 0 views

www.hairfinder.com/...how_fast_does_hair_grow.htm hair
shared by garzat5774 on 05 Nov 14 - No Cached
    • garzat5774
      garzat5774 on 05 Nov 14
       
      Your hair grows about 1.25 cm or 0.5 per month and about 15cm or 6 inches each year. but as you start to get older your hair growing slows down.
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