The Shiny Metal Disc

Waddling across the glossy tub basin, I spotted a gleaming chrome disc sitting right in the slope. I tapped it gently with my bill. Clink! The bright chime bounced instantly off the enamel walls, humming back to my ears. When I pressed closer, the metal disc tilted sideways with a tiny metallic squeak, revealing a dark, shadowy gap below. Cool air puffed softly against my feathers. I paused, tilting my head to listen to the tiny hollow whisper coming from down underneath.