White phosphorus (P4) has been identified as the cause of mortality for dabbling ducks and swans at an estuarine salt marsh in Alaska Predation of ducks poisoned by P, was monitored to assess the extent and range of predator exposures to P, Avian tissues were analyzed for P, by gas chromatography We observed that both sick and dead dabbling ducks were common prey of bald eagles (Haliaeetus leucocephalus), herring gulls (Larus argentatus), and common ravens (Corvus corax) Frank signs of P, intoxication attracted predators and rendered the ducks easy prey White phosphorus was found in the tis sue remains of ducks that had been preyed upon, thus providing positive evidence that predators were exposed to P, Although P, varied widely among individuals, P, was generally highest in the gizzard contents followed by fatty tissues such as fat de pots and the skin White phosphorus was identified in fatty tissues of one eagle and in one herring gull egg, thus providing di rect evidence of absorption of P, by predators