Vision of bats

Context

SCIENCE/ Sound energy, Uses of sound energy

Jokers of interest

Action on the board

My learners loved the detail: In German, bats are called "flying mice"

Materials

pictures of bat and fly

sello tape

coloured chalk 2 colours

LESSONS

Do you know how a bat sees the world?

A bat is almost blind at night. It sees with its ears, using sound!

How is it possible to hear using sound? What is sound?

Sound is sound waves, produced by a vibrating object.

• Stick the bat on the board
  Bats produce sound waves with their mouth or nose. Bats make rapid, high-pitched squeaks called “ultrasounds” (to high for persons to hear them).
• Draw the sound waves produces by the bat with yellow chalk on the board.
• Stick the fly on the board.
  The sound waves spread – when they hit an object, they get reflected and are sent back to the bat.
  
  
• Draw the reflected sound waves with red chalk on the board.
  The bat listens to the echo and can tell what and where the object is. This is called echolocation.