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DaRedGuy OP t1_j4xr156 wrote on January 19, 2023 at 12:14 AM

Reply to comment by B_lintu in Critically endangered Yangtze finless porpoise shows signs of recovery by DaRedGuy

Their dorsal fin was modified into a dorsal ridge that is covered in varying rows of tubercles. These tubercles are used as a sensory organ, as well as to move through the water.