I just got a 4 month old ferret last week to join my 4 year old ferret. Overall, they get along great, however, sometimes the younger (larger) one, and possibly the older one as well, will make this odd chirp, like an angry squirrel, which I have never heard a ferret make before. This does not occur during playtime and is not their normal happy or playful vocalization. It only occurs when the two are near each other but not playing, say, climbing into a hammock together. It is not really a hiss. It doesn't sound friendly, but I could be wrong.
What does this mean? Is it agressive/a dominance thing? Should I be trying to correct it?
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