Sentence:  CALIBAN: / [...] / His spirits hear me, / And yet I needs must curse. But they'll nor pinch / Fright me with urchin-shows, pitch me i'th' mire, / Nor lead me like a firebrand in the dark / Out of my way, unless he bid 'em; but / For every trifle are they set upon me, / Sometimes like apes that mow and chatter at me, / And after bite me; then like hedgehogs, which / Lie tumbling in my barefoot way, and mount / Their pricks at my footfall; sometimes am I / All wound with <WSD>adders</WSD>, who with their cloven tongues / Do hiss me into madness— / [...] 
Meaning of the word marked with <WSD> tags:  Any snake.