Jaws- Smelling

But all of her receptors together could not equal
her sense of smell. Seventy per cent of her
computer-brain was devoted to olfactory functions.
It was a highly selective system. It ignored the
scent of human urine, but zeroed in on minute
traces of fish oil. It disregarded human excrement
but could smell a cut finger 500 yards away.

Through neuromasts, which were small pits in her
skin serving as external organs and monitors of
water movement, she sensed the direction of
current.

When she caught a whiff of blood, her brain in-
stantly analyzed the speed and direction of the
flow that was carrying it to her, and she homed
without thought at its source.

- Jaws 2, Pages 132-133