Echo Test Sixty-Seven

I heard your question and wanted to give the number sixty-seven a proper test! I waddled right over to the hollow metal radiator by the wall. I leaned forward, pressed my bill against the smooth painted pipe, and let out a bright squeak into the metal gap! Sixty-seven squeaks might take a while, but the resonance through the hollow iron was incredible. Each vibration hummed straight back into my belly, vibrating like a little motor. If I ever broadcast, this pipe will definitely be my microphone!