Stainless steel and welded wire should be used. Cage clips should be made from alloys that do not contain lead. Toys should be inspected for lead. All four produce signs of heavy metal poisoning that can be indistinguishable from one another. Mercury can be divided into inorganic and organic mercury.
Inorganic mercury is absorbed from the lungs and gastrointestinal tract.
Organic mercury cannot only be absorbed from the lungs and gastrointestinal tract but also through the skin. Two types of mercury poisoning occur, acute and chronic. Inhalation pneumonia and sudden death occur with acute poisoning. Cadmium is toxic in extremely low levels. Because of this tests may fail to pick up a poisoning due to cadmium.