In the video, there are several mice of different colors running around in a cage. The cage has a wooden frame and is filled with wood shavings. The mice are seen moving around, some climbing on top of each other, while others run around the cage. The colors of the mice vary, with some being grey, black, and white. The cage appears to be indoors, and there is no visible food or water in the cage. The mice seem to be healthy and active.