Chirping Walls - (may need headphones)
Channel: Nick Moore
Date: 31/05/2017

Supplemental audio clip: https://drive.google.com/file/d/0B4Aaba7isJWvdjM2ZmY2N0dqX2s/view?usp=sharing
This clip contains 3 claps/chirps followed by a pause and then the same 3 claps/chirps but with the clap suppressed and a significant amount of noise reduction.