An environmentally friendly device for trapping animals comprising a collection container (3) comprising an upper opening (3a), an intermediate supporting frame (4), forming a drop duct (8) and such that it at least partly closes the opening (3a) of said collection container (3), a closing guard (5), which can be superposed on the intermediate supporting frame (4), comprising an inlet (6) and a compartment forming a trapping corridor (7), a trapping mechanism (9) supported by the frame (4) and positioned over the drop duct (8), comprising a rotary surface (10) having a main direction of extension (X) extending along a longitudinal axis (10a) coinciding with the direction of entry into the trapping corridor (7), being designed to close the top of the drop duct (8) and to form the treadable surface of the trapping corridor (7). The trapping mechanism (9) comprises two paltes (14a, 14b) connected to each other by the rotary surface (10), which is positioned orthogonally to each of them. Each time it is activated the rotary surface and the two plates (10) complete a 180° rotation about an axis (9a) of symmetry which is transversal to said longitudinal axis (10a) coinciding with the direction of entry into the trapping corridor (7).
