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.
Advertise With Us. Description: Squirrels are small rodents varying form 6-12 inches in body length and 4-10 inches in tail length. Weight for flying and red squirrels is 4 to 8 ounces, while that of gray squirrels is from 12 to 28 ounces. Squirrels can generally live up 10 years in optimum conditions (with gray squirrels having a slightly shorter lifespan), however many baby squirrels in the wild never even make it to adulthood due to predators.