Counter-shading
![Counter-shading - Sketchplanations](https://images.prismic.io/sketchplanations/736b3529-2770-4014-adc6-ea10af5281b2_121777755464.jpg?auto=compress%2Cformat&fit=max&w=3840&q=50)
Nifty water camouflage practised by dolphins, porpoises, some fish and other neat sea creatures. The simple strategy: look light like the sky for anyone below, and look dark like the sea for anyone above.
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