English: Radiography of swans found dead in the Audomarois marsh (north of France), highlighting a large number of lead shot from hunting cartridge, and ingested with the Grit. The swans that feed in front of hunters's huts or in front of shooting positions are very frequently victim of "waterfowl lead poisoning". Here the number of lead is exceptionally high (some hundreds), and caused the death of the animal (12 small lead pellets are enough to kill an adult swan within a few days. The poisoned swans were also more likely to collide with an obstacle (power line, for example) or vehicle. Their body will be a new source of environmental contamination of toxic lead. It is noted that a new swan population has recovered in the late 1990s in the marsh audomarois, but it feeds mainly on land, which is a source of conflict with the gardeners who cultivate drained areas and emergent marsh (Is this an adaptive behavior ?, the result of natural selection ?, with the appearance of a new behavior limiting the risk of ingesting lead pellets) It should be noted that the occurrence and prevalence of lead poisoning avian sontplus higher in Europe and North America where they were first studied. See data collected by RAFAEL MATEO (Instituto de Investigación en Recursos Cinegéticos IREC, CSIC, UCLM, JCCM) for his presentation WILD BIRDS IN Lead Poisoning IN EUROPE AND THE REGULATIONS ADOPTED BY DIFFERENT COUNTRIES upon Conference entitledIngestion of Spent Lead Ammunition; Implications for Wildlife and Humans (organized by the "Peregrine Fund" (Boise State University Idaho. May 12-15, 2008). Proceedings of the conference, which led to the book: [https: / / www.createspace.com / 3382279 Ingestion of Spent Lead Ammunition from: Implications for Wildlife and Humans, co-written by Richard T. Watson, Mark Fuller, Mark Pokras, Grainger Hunt] 2009/04/28; ISBN/EAN13: 0961983957 / 9780961983956, 394 pages.