A cage for housing laboratory animals, said cage includes a bowl and a cap or cover which may be positioned on said bowl in a removable manner, wherein the cap and the bowl, with the cap positioned on the bowl, define an internal space which is closed and not accessible from the outside, wherein in the internal space a feeder is positioned, adapted to contain food adapted to feed the laboratory animals, wherein the cage is equipped with first means adapted to detect the presence and/or quantity of food in the feeder.