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.
Red squirrels can jump as far as 5 meters (16 feet) between trees, and are uninjured during an 8-meter (25 foot ) fall. Snakes are the primary predators of red squirrels. A plastic decoy snake or a powerful squirrel repellent may deter squirrels from entering your yard or garden.