AdvertisementWATCH: How A Tick Digs Its Hooks Into YouMarch 20, 2018Gabriela QuirósfacebookEmailA tick nymph, or young tick, has dug its mouth into a human arm. Left to its own devices, this western blacklegged tick nymph will stay attached for three to four days, during which time it will drink enough blood to later molt and grow into an adult. (Josh Cassidy/KQED)