LEON: Dead Ducks The odor of death hangs over the artificial lake near this Mexican industrial city where 25,000 migrating waterfowl have died since mid- December. Water samples from the Silva Reservoir show high concentrations of the pesticide endosulfan, though local farmers and tanneries in the area deny using the chemical. As officials search for clues, the National Water Commission patrols the reservoir in a boat equipped with a siren, and volunteers set off fireworks to scare waterfowl away. Though the water has been declared dangerous for use in homes and in some kinds of agriculture, farmers continue to irrigate their...

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