wondered why cranes seem to bob their heads when they walk!
noticed that the birds first thrust their long necks and heads
out. Then they held them still while they stepped forward.
scientists had this hypothesis: When cranes keep their
heads still, their eyes can focus on details and pinpoint
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 . . .