Imagine having teeth measuring over 7.5 inches (19.05 cm) and weighing 4.5 pounds (2.04 grams).  Two such teeth were discovered near Glencoe, Ontario on October 19th, 1938 by farmer James Watson who unearthed the teeth while plowing a drained bog (London Free Press, October 20, 1938).  These teeth belonged to a mastodon, the post-glacial elephant, whose preferred habitat were the spruce forests found around London in swamps and wetlands.  The mastodon became extinct shortly after the aboriginal peoples settled in what is now Southwestern Ontario.