Rodent cage to accommodate monitoring devices

An animal containment device that includes a top wall, a bottom wall, a front wall, a rear wall, and at least one side wall. In one aspect, the device may also include an opening in the rear wall for insertion of a monitoring module for monitoring the animals within the device. In another aspect, the animal containment device may include walls made from a translucent material having a photosensitive material for controlling the amount of light within the animal containment device. In still another aspect, the animal containment device may include one or more sensors in the device and a monitoring linkage and display for displaying the data from the sensors.