Loud noises often scare them, so the tank should be in a quiet area.

Once he started the motor, the very loud noise scared the people that gathered and they immediately scattered.

Just then the overhead heaters clicked on and the noise scared him.

Conversely, loud or sudden noises will startle and scare them.

The noise of an approaching supervisor scares everyone into the latrine.

The noises had scared her, though, and she'd never tried that again.

Look, the noise is scaring the bugs out of the bark!

However, the added noise will scare herbivores and even small carnivores.

The noise scared him; by the time I got there he was halfway out the door.