The flipper is short, broad, and truncated, and the dorsal fin a mere low protuberance.
Snorkelers: The snorkeler prefers a lightweight, flexible swimming flipper that won't weigh her down.
Usually it passes from the throat (the anterior part of which, with the whole of the under jaw, is dark) above the origin of the flipper, along the middle of the flank, and descends again to the middle line before reaching the tail.
The lower numbered tag is secured to the left flipper.
As mentioned previously, the historical figure credited with inventing the swimming flipper is none other than Benjamin Franklin.