Why do striped marlin change colour? 🐟️🌈 It has long been known that striped marlin (Kajikia audax) can “light up” their skin, making their stripes appear much brighter. But why do they do it? Past suggestions include everything from reflecting their mood to confusing their prey. Now, after studying drone footage of hunting blue marlin, Alicia Burns of Humboldt University in Berlin and her colleagues have concluded that the main reason for the colour change is to warn off other marlin during h

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