What makes crane eyelids unlike yours?
need to be able to react to things quickly—literally in the
blink of an eye. When cranes duck their heads
into water to feed, the nictitating membrane can protect their eyes
from particles while they grab food. Most of the time when a bird
blinks, it is closing the nictitating membrane to keep the eyeball
moist and clear of dust and junk. But birds occasionally blink with
the outer eyelid to keep the nictitating membrane moist and clean.
When birds sleep they close the outer eyelid. What
might be the reason?
—Laura Erickson, Ornithologist and Journey North Crane Expert
—Eva Szyszkoski, ICF Tracking Field Manager
Photo Eva Szyszkoski, ICF.
North is pleased to feature this educational adventure made possible by
Whooping Crane Eastern Partnership.