Al Jazeera reports on the longest migration made by any mammal on earth.<br /><br />The Gray Whale itself is a phenomenal sight. <br /><br />These animals spend their entire lives within a few kilometers of the shoreline. <br /><br />Yet their 18,500 km annual migration take them from the Bering Sea between Russia and Alaska all the way down the coast to Mexico's western coast. <br /><br />Franc Contreras takes us to the world's oldest whale sanctuary in the Baja California peninsula.
