The mottled duck is an indicator species for wetland health on the Anahuac National Wildlife Refuge.
Thousands of snow geese visit the refuge every year. The refuge provides the habitat that many species depend upon to rest, nest and feed.
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The mottled duck is an an indicator species for coastal marsh and wetland health. Biologists are concerned about the species due to its limited range and small population size. It is a management priority of the Anahuac National Wildlife Refuge.