She usually has a normal faster than the other ducks quack. She is my only runner. Within the last week I've noticed it sounding odd and squeaky like when their voice starts to change but she seemed to have a pretty solid quack, a young girl quack but still a quack. Today she started sounding more like a seagull when she quacks than a duck. Then as the day progressed it got higher and tonight sounds light and almost like a whisper, maybe cause she's calmed down. She's eating, drinking and acting high strung and all over the place as normal, it's just her sound that's off.