Abstract: An improved bird cage structure includes a pair of symmetric right and left grid frames, a pair of symmetric front and rear grid frames, a top grid frame and a bottom grid frame. The right and left grid frames have respectively latch elements extended outward to engage with the top grid frame and fastening elements disposed at selected locations for fastening the engaging elements located at the front and rear grid frames to form a sturdy bird cage. The grid frames have respectively a slot opening to hold a slant chute for forming a collection trough. The cage may be detached easily to single pieces and packed to a small size, and can be transported conveniently at a lower cost.

Abstract: A knock-down bird cage, which includes a cage body and a stand supporting the cage body, wherein the cage body is formed of a right side panel, a left side panel, a front panel, a rear panel, a right top panel, a left top panel, a horizontal bottom panel, and a collector plate spaced below the horizontal bottom panel and defining with a respective bumper board at each of the right side panel, left side panel, front panel and rear panel a receptacle for collecting waste matter; the stand include a plurality of legs, the legs each a top mounting frame, and a plurality of clamping plates respectively fastened to the top mounting frame at each of the legs to secure the legs to the receptacle of the cage body at a bottom side.