Dorsal Fin

Real World Example

Imagine trying to keep your balance while walking on a windy day. Just like you instinctively adjust your body to stay upright against the gusts, a dorsal fin helps marine and freshwater vertebrates maintain stability as they move through water. The dorsal fin acts like a natural stabilizer, akin to how you use your arms or adjust your stance to prevent being knocked over by the wind, ensuring the animal can swim in a straight line without being easily toppled by currents.