blood vessel-a vessel in which blood circulates. vein, vena, venous blood vessel-a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary vein carry unaerated blood. venous blood system, venation - (zoology) the system of venous blood vessels in an animal. lymph gland, lymph node, node-the source of lymph and lymphocytes. vascular system-the vessels and tissue that carry or circulate fluids such as blood or lymph or sap through the body of an animal or plant. fetal circulation, foetal circulation-the system of blood vessels and structures through which blood moves in a fetus.
Squirrels are dangerous, not necessarily to humans but to their property. Squirrels will chew through and damage the structure of homes and personal property, including electrical wiring, which is a fire hazard.
Squirrels have plenty of predators, or natural enemies. They are often attacked by flying predators such as hawks and owls. On the ground, squirrels need to be on the lookout for all the foxes, coyotes, wildcats, weasels and snakes that eat them whenever they get a chance. And some four-footed predators, such as fishers and pine martins, even chase squirrels through the trees in order to make a meal of them. And, what does a squirrel eat? Squirrels eat a variety of nuts, seeds, fruits and other types of vegetation.