the.com/reef shark

means Any of several medium-sized shark species that patrol coral reefs and shallow coastal waters, generally wary of humans and more likely to flee than attack.

from Straightforward compound: 'reef,' from a Scandinavian-rooted seafaring word for a ridge of rock or coral near the surface, plus 'shark,' whose own origin is murky — it surfaces in English in the 1500s, possibly from a Mayan word 'xoc' brought back by sailors, though that link is debated. Naturalists later sorted sharks by habitat, and these became the 'reef' ones — named for their turf rather than their temper.