Predator's presence

Schaefer sat motionless in an Indian crouch, waiting for destiny to arrive, nearly invisible in his mud camouflage, one with the darkness of the trees and rocks. Suddenly, all around him, he noticed the buzz and click of insects and the croak of frogs had stopped. He immediately recognized this as a sign of the alien’s presence, for he’d come to understand that all creatures sensed and feared the invader.

   The Predator (1987 novelization), chapter 16