What this actually means for the structure of the foot is a question that is still being researched today. It would seem that an accessory navicular is commonly related to pes planus. Frederick Kidner, in 1929, first theorized that the presence of an accessory navicular could be the cause of pes planus.
Successful as they are, Eastern Gray Squirrels live only 11-12 months on average, but some individuals have survived more than ten years in the wild. Factors affecting survival include the severity of winter, abundance of food, and parasites.
What is an Eastern Gray Squirrel? The Eastern Gray Squirrel is a tree dwelling rodent, a very common species of squirrels, mostly found in North America. It is a tree squirrel, which belongs to the genus Scirus, and is native to Midwestern United states. It is often found in woodlands, suburban areas and urban areas.