Every year approximately 4,000 pairs of emperor penguins trudge across the frozen landscape to reach Snow Hill Island, turning this snowcapped island off the east coast of the Antarctic Peninsula into a crowded breeding colony. While there, the male penguin’s job is to carefully guard the egg his mate has laid, and make sure it stays warm enough so the chick inside can hatch. If your job doesn’t take you to a snow-covered Antarctic island, then why not celebrate by observing National Walk to Work Day today?