This story is free to read because readers choose to support LAist. If you find value in independent local reporting, make a donation to power our newsroom today . They’ll eat anything: Fruits, vegetables, compostable plastic bags and a rotisserie chicken carcass — which they destroyed in two days — are all fair game for the enthusiastic little larvae. They’re changing: Now that it’s been about three weeks, they’re going from white and juicy to grey and stiff, as they start to pupate.