It’s generally thought that baleen whales are too large to be successfully attacked by most marine predators.  Orcas are typically considered the only real predatory threat to large whales, and even they have to use teamwork to take down a young whale.  Large sharks, which also sit near the top of the marine food web, are known to scavenge on whale carcasses as a nutritious and blubbery supplement to their usual diet of fishes and smaller marine mammals.  However, evidence has been found that white sharks actually take a proactive approach to increasing the whale carcass supply by attacking live northern right whale calves.  Now researchers in South Africa directly observed dusky sharks actively teaming up to bring down a humpback whale calf.

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