the head-bobbing hypothesis:
what the scientists did to test their hypothesis:
meal worms and other goodies on the ground for the cranes.
the birds' behaviors with video cameras.
at each video frame and recorded the position of each birds
head and legs.
Here is what they discovered:
birds' heads were perfectly still 50% of the time (as their
legs moved forward).
concluded that this must help the birds to focus on and
pinpoint dinner! (When they move their heads, they can tell
how far away their food find is!)
they still had questions. For instance, Does keeping
its head still for so long help a bird sneak up on its prey?
What new questions do you have?
did this story tell you about science and how scientists
work? (For instance, they start with observations that
lead to questions.)
Once you're written down your thoughts, click for
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