Background about Groundhog Day (February 2) and groundhogs (or woodchucks). "In Canada, it was 1956 before Wiarton Willie became a household name for his early February prognostications. ... Nova Scotia has Schubenacadie Sam, who's the first in the country to rear his head on Groundhog Day." Includes sidebars with quick facts and related links. From the Canadian Broadcasting Corporation (CBC).