Predator.

He can hear your loud breathing,
So calm it down and sigh,
Maybe if we're lucky he will
Only pass us bye.

Don't shift, don't move or make a sound,
He'll hear it, don't you know?
He likes the chase, he loves the hunt,
So silent, keep it slow.

He can hear your heartbeat rush,
It rattles in your chest,
There's little you can do to put
Your fears all at rest.

He can smell your sweat and fear,
Like a perfume to his nose,
And our aura is a beacon bright,
Our being kind of glows.

Once he's found us we are dead,
We cannot run/escape,
The only thing is we can hope
Yet that hope won't take shape.