Boxfishes are little boxes of armor. Their only moving parts are eyes, mouth, and fins! Females are a dark brown covered with white spots. Males are a beautiful blue with white spots only on the back, and some gold highlights. And, despite their somewhat ungainly looking shape, they’re actually excellent swimmers.
Graham's Island 
Great photos of little dangers of the deep. I can see why they are constant fin flappers. Those fin are so small.
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Small but effective. They can easily outswim a human!
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Fish are good at the dart and disappear
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You’ve taken very good shots of them. Are they eaten, or is the armour too tough to cut through?
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You could cut through it, but the fish are quite small so not ones that you’d want to catch. Oh, and they’re somewhat poisonous too!
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Footnote
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Kinda cute
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They are, especially as they’re quite small.
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They look very interesting
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They are. I like to watch their little fins going as they maneuver.
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