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Drop in Shark Numbers Startles Researchers

Many species of shark are in decline, a development some researchers have been slow to note. The shark plays a pivotal role in the health of all marine life, and some fear the population dip could throw the underwater ecosystem out of balance. NPR's Richard Harris reports.

Copyright 2003 NPR

Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.