According to the Environmental Protection Agency, draining of wetlands for development has destroyed more than half of those once found in the U.S. Bird populations have decreased because of this, though the rate of loss has slowed. Human activity including pollution and the introduction of non-native species are also major threats. Diking and damming, dredging, diverting streams, depositing fill dirt, grazing by livestock continue to be responsible for much of the damage to our wetlands.
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