Hunting restrictions have also banned the use of lead shot while hunting migratory waterfowl in at least 29 countries across by international agreement, for example the Agreement on the Conservation of African-Eurasian Migratory Waterbirds. Depending on hunting laws, alternatives to lead shot are mandated for use by hunters in some locations when hunting migratory birds, notably waterfowl. In the US, the restrictions are limited to migratory waterfowl, while Canadian restrictions are wider and apply (with some exceptions) to all migratory birds. The hunting of upland migratory birds such as mourning doves was specifically excluded from the 1991 US restrictions as scientific evidence did not support their contribution to the poisoning of bald eagles. In 1985, Denmark banned the use of lead in wetlands covered by the Ramsar Convention, later expanding this restriction to the whole country. The use of lead has been banned for all hunting activities in the Netherlands as of 1992.