User blog comment:Kogath/Monster Hunter X Discussion/@comment-25083735-20150710192336/@comment-24231002-20150710202253

err i would say she swims pretty fast just by looking at the tail,i belive crocodiles does use their tails to swim if i remenber right.

she is also very slender,so it helps when swiming at high speed

there is also her hand that has membrane to help with swim(i forgot the actually name of this thing),look really close into the arts in the capcom MH JP site scans