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.
Types of Wolves. Wolf Species Index. Wolf Species. The Gray Wolf is the one most people are familiar with. They can be all colors and range in size depending on where they happen to reside. Gray Wolf. The Common Wolf is also known as the Gray Wolf. This is the type of wolf that most people are familiar with. Arctic Wolf.