Abstract: A mousetrap includes a liquid-containing tank and a housing removably positioned on the tank, the housing defining two trap chambers having drop floor sections. A gate which is movable by a motor is movably positioned to cover the opening into one or the other of the trap chambers. When a mouse enters the open trap chamber to eat bait and contacts a sensor of a microswitch, the motor causes the gate to move and trap the mouse in the trap chamber, concurrently causing the drop floor section to be released. The weight of the mouse causes the drop floor to pivot downwardly, resulting in the mouse being dropped in the tank therebelow and drowning. The other trap chamber is in the meantime opened for trapping another mouse and causing it to become drowned.