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![Cephalic fins at work....](https://archive.svbeachhouse.com/wp-content/uploads/2009/02/2008-9_Webphotos_San_Benedicto_Island-4311.jpg)
Like flaps on an airplane, these fins are in frequent motion to assist in steering and hovering.
Isla San Benedicto – Revillagigedos Archipelago, Mexico
February 2, 2009