Assertion: hammerhead shark | /r/HasProperty | abundant
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text: In coastal areas of the Mediterranean Sea, hammerhead sharks in general were once abundant but haven’t been seen since 1963 [pdf]. Off of South Africa, populations have declined more than 99 percent since the 1950s [pdf]. And off the coast of the northeastern U.S., a well-known 2003 paper [pdf] on shark population declines in the previous 15 years noted that “the trend in abundance is most striking for hammerhead sharks.