The hump is where the Atlantic humpbacked dolphin’s dorsal fin emerges from. Some people think that dorsal fins help dolphins remain stable while they are in the water. Dolphin’s fins vary among different species. Their fins can be falcate, triangular, rounded, or they might not have a dorsal fin. Some river dolphins lack dorsal fins and only have humps or slight ridges on their backs. Blood vessels in dorsal fins play a role in controlling body temperature. Blood vessels found in humps and very small dorsal fins probably do as well.
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