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It's a weird dynamic they have. They're clearly not adult versions of the animals that Bing etc are. They also don't appear to be their parents - more like guardians of some sort. All the architecture, furniture and so-on is clearly designed for creatures larger than Bing, and Fopp even has to get a stool to reach the counter tops. Everything points to absent adult versions of the animals, but as @TW says: where are they? Maybe they all fucked off once they worked out their entitled little shits of children were a lost cause, leaving some weird voodoo doll caretakers to stop them scalding themselves or getting mauled by (inexplicably different scale) stray cats.
There's two isn't there?
How many more do you want?