1 Canker sores are small, painful ulcers on the inside of the mouth, tongue, lips, or throat. 2  Symptoms of canker sores include small, painful, crater-like ulcers.  See a doctor if canker sores are accompanied by fever, last more than three weeks, or the affected individual has difficulty swallowing.
When people think of wolves, one species usually comes to mind: the gray wolf. The gray wolf is the largest wolf and the basis of legends. According to National Geographic, the breed was almost hunted to extinction in the lower 48 states of the United States. Even now, few exist outside Alaska.
By Eric Bank. The gray wolf takes top honors as the largest wolf extant in the world. This imposing creature stands from 26 to 32 inches tall at the shoulder and can extend as long as six feet from nose to tail. The heaviest wolf on record tipped the scales at 175 pounds. Males outsize the females, and the largest individuals live in northern latitudes. The scientific name for the wolf is Canis lupus.