A sharks dorsal fin will have a straighter trailing edge while the dolphin and porpoise have a very curved trailing edge dorsal fin.
Sharks tail fins are vertical and sometimes break the surface whilst Dolphins, porpoises and whales tail fins are horizontal.
If the fin appears to be bouncing up and down it could be a dolphin but if the fin moves back and forth it’s a shark.
Dolphins surf the wave whilst sharks move across it.
A dolphin’s dorsal fin curves smoothly from the animal’s back. A shark’s dorsal fin has a triangular notch at the base on the rear side, separating that part of the fin from the shark’s back.
a school of Dolphins vs A shark
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