Abstract: An animal cage having a rectangular main body with a bottom, top and sidewalls defining a first inner space for the animals. A first sidewall of the main body includes a first opening to allow access into the first inner space. Attached to the cage is a secondary rectangular body having a bottom, upper and sidewalls defining a second inner space. First and second sidewalls of the secondary body respectively include second and third openings, the second opening being parallel and aligned with the first opening, and the third opening being formed orthogonal to the first and second openings. The first sidewall of the main body includes a rotatable gate that is switchable between a first position which closes the first opening, and a second position which clears the first and second openings while rotated into the second inner space and closes the third opening of the secondary body.

Abstract: 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 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, wherein a