What they found was very interesting. Fiddler crabs from the polluted site eliminated about 12% copper, 76% lead, and 22% zinc with their moult. Notice the skew? That’s a lot of lead shed off with the moult! Conversely, fiddler crabs from the clean site eliminated a significantly lower amount compared to ones from the polluted site (3% Cu, 56% Pb, 8% Zn). So not only are fiddler crabs in lead-polluted sites mobilizing excess Lead to the exoskeleton, they appear to be preferentially doing so as a depuration mechanism.