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.
Southern flying squirrels are adorable pet rodents that have the unique ability to glide through the air, just like sugar gliders. They can be found wild in the United States and can make a good pet for the right person. Names: Glaucomys volans, Southern flying squirrel, Assapan. Expected Lifespan: 10-12 years