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About 300,000 cetaceans—whales, dolphins, and porpoises—are inadvertently caught in fishing nets each year. New genetic analysis of Franciscana dolphins led by Martin Mendez, a postdoctoral fellow at the Sackler Institute for Comparative Genomics at the American Museum of Natural History, reveals that related Franciscanas are often netted together. This bycatch pattern may cause a significant loss of genetic diversity in this already rare species.