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.
Many people consider the fox a dangerous animal. I know, because I get a lot of concerned phone calls and emails from people who are worried that a fox is going to cause some harm to them.t is true that to see a fox in a place where people live is a strange sight and no one should ever try to pet or corner a fox in order to catch it with their bare hands as they will become aggressive when cornered. But in general, foxes are not especially dangerous to humans or some pets.