A self-powered toy comprises a relatively small toy animal and a relatively large toy animal having an openable mouth. A reel provided inside the large animal is connected to a drive and has a line connected to it that extends out the mouth of the large animal and is attached to the smaller animal. In addition the large animal, which may be constituted as a floatable fish or the like, is provided with means for propelling it through the water so that the drive unit can propel this large animal through the water and simultaneously reel in the small animal. Thus the large animal will appear to pursue and then eat the small animal as it pulls the small animal into its openable mouth.