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.
The eastern gray squirrel is a very common, North American, tree dwelling rodent. It is found in a great variety of woodland, parkland and suburban and even urban habitats. The principle requirement to make a habitat suitable for a gray squirrel is a predictable abundance of food.he body of a gray squirrel was once even found in the stomach of a large mouth bass! Gray squirrels' most significant predators, though, are unquestionably birds of prey, especially hawks and owls. Gray squirrels are diurnal animals.