The Problem with Lead Shot
When hunting with a shotgun, it is important to consider how the ammunition you use will affect the environment. Though lead shot is preferred by many shotgun hunters, lead is a toxic substance that contaminates the ecosystem. Especially when hunting waterfowl, the lead leeches into the water table, and is sometimes eaten by waterfowl - this causes lead poisoning in many of the species that are found in that habitat.
It is now illegal in Canada to use lead shot when hunting waterfowl. Steel shot is now considered the ammunition of choice. Hunters are encouraged to use non-toxic shot when hunting any animal, including upland game birds.