The Mollusks—generous hosts when they weren’t trying to kill you.
The boys had asked why, if it acted slowly, was it called quicksand. The Mollusks had replied that, as far as they were concerned, most English names for things were silly. The word that they used for quicksand was a deep grunt that translated roughly to "uh-oh.
I'm interested in other animals too though. There's the slug in "Mollusks", and I wrote a story about bees and one about a cat which got thrown out a window by mistake, but those never made it into the collection.