Abstract: A reusable or disposable rodent trap is described having only two discrete parts, particularly suited for trapping small animals including rodents such as mice, in which the trapped animal may be made to expire by asphyxiation rather than trauma or poison. The trap comprises an enclosure typically having the shape of an elongated box with an opening at one end, and closing said opening a hinged one-way door adapted to swing freely upward into the enclosure to permit entry into the enclosure by an animal, said door having on its surface a plurality of small orifices to allow the diffusion to the exterior of the trap of scent from bait placed within the otherwise nearly air-tight trap. A rodent attracted by bait scent emanating from the orifices in the door is able to enter the trap by pushing against the closed door, thereby causing it to pivot upwardly open into the enclosure.