White shark (Carcharodon carcharias) off the coast of Stewart Island (New Zealand). Despite new shark species being discovered at accelerating rates, their global diversity remains poorly known and shark declines are occurring globally at increasing rates (see Randhawa et al. this issue). These patterns could explain why fewer species extinctions are observed than predicted by models. It is even possible that some shark species may be lost prior to their discovery. Photo by Mark Enarson.
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