The system that circulates blood through the body, consisting of the heart and blood vessels. In all vertebrates and certain invertebrates, the circulatory system is completely contained within a network of vessels. In vertebrates, the lymphatic system is also considered part of the circulatory system.
While a squirrel isnât going to pen the next bestseller or ace a calculus class, the squirrel is smart in his own way. When looking at animal intelligence, humans shouldnât judge animals by human standards.
Like other squirrels, it has large eyes set on the sides of its head that allow it to see all around with little movement of its head. It can see above and below, an adaptation well suited for life in the trees where danger can come from the ground, through the air, or along a nearby limb.