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.
Doctors in Kentucky have issued a warning that people should not eat squirrel brains, a regional delicacy, because squirrels may carry a variant of mad cow disease that can be transmitted to humans and is fatal.lthough no squirrels have been tested for mad squirrel disease, there is reason to believe that they could be infected, said Dr. Joseph Berger, chairman of the neurology department at the University of Kentucky in Lexington.