Just a question of further quests.
See the Insectrist skill on page 248.
Pets, mostly. I think of Crickets as being like watchdog pets; loud when you need 'em to be. Beetles are used in the comics for delivering messages, but I also thought mice might eat 'em on occasion…
My mice use teams of beetles to pull wagons.
Thx, helps.
My mice use crickets like we use dogs.
Sledding? 
So beetles are like ox and crickets are like horses?
You’ll find your answers here.
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Mice are omnivores…
Yep; no mouse will pass by the idea of having some tasty cricket or beetle. They’re more or less the only critters they can effectively overpower, and thus eat.