ANATOMY OF A SQUIRT Sea squirts are tunicates, a type of sea life with a firm, rubbery outer covering called a "tunic," from which the name derives. As each organism feeds on algae and bacteria, they suck water in through one pipe and push it out a second. These bursts of water gave it the name "sea squirt." (Illustration by Jayne Doucette, WHOI Graphic Services)
