Here's a breakdown of its key features:
* Smooth: Their skin lacks scales, making it sleek and hydrodynamic.
* Dark: Typically, their skin is a deep blue or black on the dorsal side (top), fading to a lighter grey or white on the ventral side (bottom).
* Oily: This oiliness helps reduce friction and resistance as they move through water.
This combination of features helps swordfish be efficient hunters and powerful swimmers.