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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.
The mallard, the common wild duck, for instance, would be well advised to make its nest some weeks later than it usually does.
The mallard duck is indigenous to this country.
In this respect they are about as different from mallards as can be imagined.
I did not suggest there was a shortage or a running down of mallard.
Most of the mallard ducks of my acquaintance have now produced some young.
Its two rivers no longer flow black with coal dust but have herons and wild mallards nesting there.
There were some wild rabbits, and a pair of mallard used to breed there.
