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.
Some tree squirrels are better at remembering where they buried food than others. Tree squirrels are part of the Sciuridae family. Tree squirrels have adapted well to cohabiting alongside humans in urban areas. They consume a large variety of foods from nuts to insects.