wild mallards have more "goose-like" bills than their ancestors: a case of anthropogenic influence?wild populations of the world's most common dabbling duck, the mallard (anas platyrhynchos), run the risk of genetic introgression by farmed conspecifics released for hunting purposes. we tested whether bill morphology of free-living birds has changed since large-scale releases of farmed mallards started. three groups of mallards from sweden, norway and finland were compared: historical wild (before large-scale releases started), present-day wild, and present-day farmed. higher density of bill l ...201425514789
[lead poisoning in norwegian waterfowl (author's transl)].in connection with routine autopsy of wild birds, liver samples from 56 waterfowl, representing 12 species, were analyzed for the content of lead. the median value for the birds examined was 0.2 microgram pb/g wet weight. concentrations probably causing lead poisoning were found in 1 mallard (anas platyrhychos) with 11 microgram pb/g liver and in 8 whooper swans (cygnus cygnus) with 5.8--55 microgram pb/g liver. clinical observations and pathological findings of "typical" lead poisoning were fou ...1978693280
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