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![Cephalic fins unfurled](https://archive.svbeachhouse.com/wp-content/uploads/2009/02/2008-9_Webphotos_San_Benedicto_Island-2611.jpg)
These specialized fins were used for both feeding and steering as well as occasionally “putting on the brakes”.
Isla San Benedicto – Revillagigedos Archipelago, Mexico
February 2, 2009