Various species of wild birds, especially waterfowl such as mallards, constitute an important reservoir of avian influenza viruses.
In mallards there were many more juvenile than adult echinostomes and the ratio of adults to juveniles was 1:11 (table 1).
The remaining three mallard samples, as well as the gull sample, were negative.
In the last week, a number of early migratory birds, for example mallards, have been found covered in oil.
The mallard had gone, and that little area of land was dead.
The findings were based on a sample of 2,683 birds from 24 species of which mallard formed a significant number.
Are we absolutely certain that mallard are threatened?
That can hold 2,000 widgeon or mallards in winter.
