Abstract: A bee hive assembly comprising one or more hive elements supported as a stack on a base element and covered by a roof element. Each hive element comprises a frame having at each of two opposite sides a window-like frame opening covered by a transparent panel. A liquid storage tank is fittingly mounted in the frame opening inwardly of and spaced from the transparent panel. The storage tank has transparent walls, a removable cover closing its upper side, and a drinking trough formed at the bottom end of the rear wall of the tank and having a width smaller than the width of the body of a worker-bee. The tank is provided with a liquid level control for maintaining the liquid in the drinking trough at a constant level which is accessible to the bees from the interior of the hive.