None of the guinea pigs I have now are chirpers but I have a had a few in the past that were chirpers. It seemed to me that the chirping was a warning to the other guinea pigs. In every case, they chirped the first time after being startled. The first time I heard it, it was in the middle of the night, something fell and the sound of the chirping woke us up. It sounded like a bird was loose in the house. That guinea pig continued to chirp on and off for the rest of her life, although after the initial time, it no longer seemed to be a warning but just when she felt like doing it. She had the pretties chirping sound. It sounded like a singing canary. The others sounded more like regular chirping. I attached a video of another one that had a regular chirp. This video was taken in 2008, before I had a coroplast cage so I hope that's not a problem. It was evening and I went into the kitchen which startled her. She started to chirp so I ran to get my camera. It was the only time I recorded any of them. I hope this works:
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