Tuna are completely streamlined for fast swimming and they are the only fish which can fold all their fins right next to their bodies when they are swimming really quickly.
(Tuna; are; completely streamlined for fast swimming) (they; are; the only fish which can fold all their fins right next to their bodies) (the only fish; can fold; all their fins; T:right next to their bodies; T:when they are swimming really quickly) (they; are swimming really quickly; )
Tuna they the only fish they
are are can fold are swimming really quickly
completely streamlined for fast swimming
the only fish which can fold all their fins right next to their bodies
all their fins T:right next to their bodies T:when they are swimming really quickly