Figure 32.11 Modern Jawless Fishes (A) Hagfishes burrow in the ocean mud, from which they extract small prey. They also scavenge on dead or dying fishes. Hagfishes have degenerate eyes, which has led to their being called (inaccurately) “blind eels.” (B) Many species of lampreys are ectoparasites that attach to the bodies of living fishes and use their large, jawless mouth to suck blood and flesh. This species lives in freshwater rivers, but some lampreys can live in marine environments.