They seem to make a snorting sigh when annoyed? Anyone heard of this? Can only be heard during a rat phoning (which is why they are annoyed) Not a from the distance noise. It's not continious, itä's a one time sound, have done it their whole life, got them at 6 weeks, now 3,5 months. Once had a rat which made the same noise, but in a continuous way, when excited or something, stopped the next day. Another rat made it when it was cold and then it was gone when it was warm again, but that was also continuous.