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A killer whale's coloration is a form of camoflage called 'countershading'. When viewed from above, the orca's black back helps it blend into the dark water; when viewed from below, the white belly helps it blend into the light from the surface. In addition, the darker coloring of the back might protect against UV damage from the sun.

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Q: Why is an orca dark at the top and light at the bottom?
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