Have the bookmunchers emigrated?

After a flurry of bookmuncher appearances last week (6 of them now occupy the bookmuncher observation chamber i.e. clear plastic dish), I have not spotted any running around in the house.  Could it be that the captive bookmunchers have somehow alerted the free bookmunchers that there is a supremecist capturing bookmunchers, holding them captive in a compound with possible intention of exterminating the lot?  But how, security here is so tight?  Maybe there is some sort of underground secret communication channel, a Bookmuncher Broadcasting Channel, or BBC, that sends covert messages ...

... or maybe they all buggered off, I mean emigrated ... perhaps to the house of the loud neighbours next door with their smelly cooking, and who constantly leave the rubbish lying around out side their house.  I really think there ought to be a law that allows neighbours to evict another neighbour because of smelly cooking.  But I digress, yes, those bookmunchers think the books are greener on the other side ... but they're in for some nasty surprises!

I thought I heard squeaks coming from the observation chamber ... do bookmunchers make sounds?  I can't handle the tension ... 6 of them, 1 of me ... something's gotta give ...