This photo from Discovery Channel shows a great hammerhead, one of the largest sharks in the world, during an episode of Shark Week. Discovery Channel/ AP hide caption

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After Sketchy Science, Shark Week Promises To Turn Over A New Fin
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A great white shark swims near Guadalupe Island off the coast of Mexico in a promotional image for Discovery Channel's Shark Week in 2013. The network special Megalodon: The Monster Shark Lives opened Discovery's annual Shark Week programming in 2013. Andrew Brandy Casagrande/Discovery Channel/AP hide caption

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When Wildlife Documentaries Jump The Shark
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Take a bite — or or maybe don't — of this beer-battered mako shark taco with cabbage, pico de gallo, avocado, arbol chile and cream from Guerilla Tacos in Los Angeles. T.Tseng/Flickr hide caption

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