He concluded, "There was evidence that Greenland sharks were slow swimmers, but this study really proved just how slow they were!"
MSN: Presenting the world's slowest shark - Technology & science - Science - DiscoveryNews.com | NBC News
There's a good chance, then, that the slow-moving Greenland sharks are simply able to approach a snoozing seal and enjoy a relatively easy dinner.
Killer whales might be able to eat them, Watanabe suspects, but Greenland sharks usually stay within deep water that killer whales do not frequent.
When the stomach contents of Greenland sharks have been analyzed in the past, scientists have found a lot of fish, but also fresh seals that weren't just scavenged.
"How Greenland sharks hunt seals remains a mystery, " Watanabe said.
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