Collapsible animal house or placement, in particular a birdhouse, comprising an appropriately rigid and during the use horizontally arranged bottom platform, an appropriately rigid roof, namely a saddle roof with a ridge which is at least in the assembled i.e. functional state of the house arranged above said bottom platform, and at least two transversal walls (3, 4), namely a front wall and a rear wall, which are located at a desired distance apart from each other and extend at least approximately perpendicular with respect to said bottom platform between the last and the roof in a direction transversally with respect to said ridge, wherein the direction of said ridge on the one hand defines a longitudinal geometric axis (x) of the house, while on the other hand a central vertical plane (v) extends throughout said ridge, wherein the bottom platform of the placement is formed by two sufficiently rigid and identical rectangular panels (11, 12), which are pivotally connected with each other in the area of a fold, which is located in the central vertical plane (v) of the house, and that the roof is formed of two panels (21, 22), which are on the one hand pivotally connected with each other in the area of said ridge and similarly like panels (11, 12) of the bottom platform in the area of the central vertical plane (v) of the house, and on the other hand said panels (21, 22) are each per se pivotally connected with each belonging external longitudinal edge (110, 120) of each neighboring panel (11, 12) of the bottom platform, and that said placement is also furnished with at least one retaining means, in particular a wall (3, 4), which is capable to maintain or retain said panels (11, 12) of the bottom platform in their aligned co-planar position within a single plane, and herewith indirectly also maintaining of panels (21, 22) of the roof in their straddled position apart from each other in a direction away from the ridge, and consequently, the overall stability of the placement as such in its assembled ready-to-use state, characterized in that such house comprises a front wall, which is pivotally connected with said panels (11, 12) of the bottom platform and comprises a fold, which is located within the central vertical plane (v) of the house, as well as the rear wall, which is also pivotally connected with said panels (11, 12) of the bottom platform and is also furnished with a fold located within the central vertical plane (v) of the house, wherein said front wall comprises preferably slanted external corner areas (31, 32), and each panel (21, 22) of the roof is furnished with correspondingly located throughout passages (211, 221), wherein said corner areas (31, 32) of the front wall are adapted to cooperate with said passages (211, 221) in the panels (21, 22) of the roof in such manner that the front wall in said straddled position of said panels (21, 22) of the roof is insertable into said passages (211, 221) and can be arrested therein, so that the panels (11, 12) of the bottom platform, which are connected with said front wall, are maintained in their aligned co-planar position, and simultaneously also the panels (21, 22) of the roof are maintained in their straddled position, and wherein said rear wall comprises preferably slanted external corner areas (41, 42), and each panel (21, 22) of the roof is furnished with adequately throughout passages (212, 222), wherein said corner areas (41, 42) of the rear wall are adapted to cooperate with said passages (212, 222) in the panels (21, 22) of the roof in such manner that the rear wall in the straddled position of said panels (21, 22) of the roof is insertable within said passages (212, 222) and can be arrested therein, by which the panels (11, 12) of the bottom platform, which are connected with said rear wall, are maintained in its aligned co-planar position, and simultaneously also the panels (21, 22) of the roof are maintained in their straddled position, and wherein the bottom platform with said panels (11, 12), the roof with said panels (21, 22), as well as the front wall and the rear wall are all together conceived as an integral cut-off piece of appropriately rigid panel consisting of a thermoplastic polymeric material, wherein said folds (10, 20, 30, 40) arc formed by means of compression and/or adhesion.