There are a few localized (and therefore vulnerable) sites where they gather for winter. In spring they migrate back up north to breed. There are some western populations that overwinter off the coast of CA.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."