My gerbils chirp and chatter to each other almost constantly.... I have read that if they chirp, it means they are not happy with each other but they have never had a falling out before and get on brilliantly with one another, but i've only ever read that it's a sign of aggression or a challenge?

Is it possible that they just like to communicate with each other?

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R.I.P Buster - Causing mischief over the bridge, sleep tight soldier

Sandy and Dusky used to chirp when I whistled. Imagine the shiock it gave me when I first did it! they used to chirp to each other occassionally. They stopped doing it in the end and somehow silently communicated to each other. They never had a falling out in their life.

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7 guppies Alvin, Theodore, Simon.

R.I.P Dusky, Storm, Sandy and Ebony.