Back to Structures Home Page Bibliography/Webliography SKELETONS   Find out about Insects! Find out about Skeletons! Build-A-Bug! Read a book about insects!
Kid Flapping Arms Bird Flapping Wings
When you flap your arms, you may stir up a breeze, but you won't leave the ground, because your bones are heavy.
Birds have much lighter skeletons because they're hollow. This way their wings can lift them into the sky.
 
Bones in Motion
  ...swim just like a fish? Swim like a fish?
  ...jump just like a frog? Jump like a frog?
  ...and why can't you fly just like a bird when you flap your arms? Fly like a bird?
X-Ray Vision
Go to 'Bones in Motion' Go to 'Boneless Wonders' Go to 'Compare a Skeleton' Go to 'Explore More'