This Metabolic Cage for Rats enables collection of behavioral information, blood, urine and feces when part of the Culex animal handling system, or it can be used alone strictly for metabolism studies to collect urine and feces. It is likewise an ideal cage for continuous infusion studies for toxicology or metabolism studies or both. This is a “replacement part” or add-on for those wanting extra clean cages on hand to cycle through their experimental protocols. The Metabolic Rat Cage can be used on the basic Metabolism Stand, offered to the right. Each Cage is supplied as a complete kit. A stand must be purchased separately.