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.
Confidence votes 228. Typically, the urine of all animals can harm us humans. Hence, it is best to avoid coming in contact with, or inhaling animal urine or feces. Sometimes, contact or consumption(in the case of toddlers) of urine and feces of pets(dogs, cats,etc.) can lead to a harmful disease called Leptospirosis.Hence, it is best to avoid unnecessary contact with our pets excreta.possums would be most dangerous to cat than humans because  opossums when near a human would usually drop and play dead because  they are afraid of us. However, for cats th â¦ y might actually fight  them because of their size but, you never know if they will be  scared of cats as well.