Arctic Tern with Calls and Chick - Bob Armstrong's Nature Alaska

When Arctic tern chicks hatch the parents will protect them for a few days at the nest site.
Eventually the chicks will leave the nest site and hide amongst the rocks or vegetation.
They can recognize the calls of their parents and come forward to accept fish when the parents call.
Why is this important?
This helps the chick avoid predation by only coming into the open when a parent has food for it.