Cage for housing laboratory animals

A cage for housing laboratory animals, said cage comprising a main box-shaped body consisting of a bottom wall, an upper wall and a plurality of side walls, said bottom wall, upper wall and side walls being connected and joined together to define a first inner space (Si1) available to said laboratory animals, wherein a first side wall of said main box-shaped body comprises a first opening adapted to allow the access to said inner space from the outside by an operator, and wherein said first side wall comprises a gate which is switchable between a first position, in which it substantially closes said first opening, and a second position, in which it at least partially clears said first opening, wherein said cage comprises a secondary box-shaped body consisting of a bottom own wall thereof, an upper own wall thereof and a plurality of own side walls thereof, said own bottom wall, upper wall and side walls of said secondary box-shaped body being connected and joined together to define a second inner space (Si2), wherein a first own side wall of said secondary box-shaped body comprises a second opening, said secondary box-shaped body being adapted to be externally applied to said first side wall of said main box-shaped body with said second opening positioned at said first opening so as to allow said laboratory animals, with said gate in said second position, to access from said first inner space to said second inner space and vice versa, from said second inner space to said first inner space;

• wherein said gate comprises a door which is rotationally switchable, wherein a second own side wall of said secondary box-shaped body joined to said first own side wall of said secondary box-shaped body comprises a third opening, and wherein the switching of said door from said first position to said second position results in the closing of said third opening.