/Back in the LARP days, we mused over what kept the ecosystem of monsters going. It had to be slow, dim-sighted and dim-witted, breed like crazy, reach eating weight in a matter of weeks and be delicious/

This is the basis for the Rolemaster 'monster' the Gabbit. I think the Slabbit came later from some left over funfur. There were props, though I don't remember the monofilament version.