Each fall, the V-formations of Canada geese stretching across the southern skies remind us that winter is on its way. As days become shorter and temperatures begin to fall, animals across the country are busily making their over-wintering preparations. Most Canadian mammals remain active throughout the year, while most birds will escape the cold by flying south. But for about 25 percent of Canada?s roughly 175 mammal species and all Canadian terrestrial reptiles and amphibians, hibernation is the only means of surviving the winter. While these animals busy themselves preparing for their long winter sleep, NCC is ensuring that their rest is not interrupted by human activity.