According to seaworld.org, scientists aren’t completely positive as to why the dorsal fin curves. In the wild 23% of orca’s have a bent fin. They speculate that it might have something to do with how much time the animal spends at the surface. The more time spent above the surface of the water, the less the water will support the fin and thus stiffen it. There are other theories which you can find on the attached site.
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