Fun fact! Most fish use their caudal (tail) fin for propulsion, but boxfish primarily propel themselves forward by combining anal, dorsal and pectoral fin beats. This slow and relatively clumsy swimming is compensated for by a tough shell-like skin that acts as armor and a toxic secretion to deter predators. https://www.facebook.com/photo.php?fbid=10153422308255603&set=a.10152575329380603.958289.10150120463815603&type=1
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