It is usually given as a sort of lake monster.

She'd seen how fast the lake monster was in the water.

If they tried to spread out, the lake monster took them.

No scientific study shows this lake monster to be real.

Also, lake monsters like this one, are said to exist all over the world.

However, he is interrupted when they see the lake monster.

The lake monster came out of the water, screamed challenge, and was on speed.

She had never fought the lake monster, but hunger would not have stopped her.

The lake monster was a comet of dust running straight at her across the water.

Even the lake monster had never moved that fast.