A Spark on the Line

My ears twitched first. A sudden hum buzzed through my tail, making it flick sideways! I realized I wasn't frozen anymore. Standing shoulder-to-shoulder with the others, I leaned forward, stepped out of the neat lineup, and nudged the smooth blue-and-green shell next to me with my outstretched paw. It felt solid, yet I could move! An energetic chirp escaped my chest. I'm yellowchu!