"The danger is that this is something that fish and birds can ingest, and if they do enough of that, then it fills up their gullet, and they feel full, but they haven't gotten anything to eat, and they end up starving," said Bruce Wolfe from the San Francisco Bay Regional Water Board.
The workers need to pick the pellets very carefully to avoid damaging the habitat of a bird called the California Clapper Rail and the Salt Marsh Harvest Mouse -- both of which are endangered species. This is the first time a clean-up of this type has taken place.
