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It has been far too long since we posted a spectacular tetraodontiform fish (my favorite order!). Therefore, as a special Monday treat, let us bask in the prickly protrusions of Chaetodermis penicilligerus, AKA the prickly leather-jacket. This filefish lives in a wide swath of tropical ocean from the east coast of Africa all the way to the islands of the Central Pacific. The prickly leather jacket grows up to 31 cm (1 foot) in length and eats all manner of small marine algae and tiny invertebrates.

The body of this fish acts as a sort of marine ghillie suit–obscuring the contours of the fish to hide it from predators and prey alike. The more famous leafy sea dragon has a similar modus operandi, but as a seahorse it lacks the filefish’s indomitable spirit (which you can maybe glimpse even in these digital images if you look into its angry, prickly eyes).

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