Lead shot in Bewick's Swans

摘要: The totally protected Bewick's Swan Cygnus columbianus bewickii population was found by X-ray to have 34% of its individuals carrying shot in their tissues, a proportion not dissimilar that quarry species. A good deal the appeared been received between first and second winters. higher level still adults at least 5 years old. This may reflect changes shooting regulations part range. effect this illegal is examined. effectiveness species legislation questioned.