Ixodes ricinus, commonly known as the sheep tick or castor bean tick, is a species of tick found primarily in Europe and parts of Asia. It is a small arachnid, typically measuring 1 to 3 millimeters in length. This tick is known for its role as a vector for various diseases, including Lyme disease and tick-borne encephalitis. The life cycle of Ixodes ricinus includes four stages: egg, larva, nymph, and adult. These ticks prefer humid environments and are often found in grassy or wooded areas. They feed on the blood of mammals, birds, and reptiles, which is essential for their development and reproduction.