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.
Best Answer: Rats ARE squirrels. They have moved inside, and tend to live on things that are barely edible, and I don't know what caused them to lose the hair from their tales. The other thing is, rats carry many diseases. That's about it for differences. Oh, and I won't eat a rat, just because of the diseases, but squirrel is pretty good.