- Scientists
wondered why cranes seem to bob their heads when they walk!
- They
noticed that the birds first thrust their long necks and heads
out. Then they held them still while they stepped forward.
- The
scientists had this hypothesis: When cranes keep their
heads still, their eyes can focus on details and pinpoint
food.
- They
knew from other research that when a bird's head moves forward,
it jerks. That makes details look blurry, but it helps a bird
to judge distance.
Next: Try walking like a crane . . . |
