Happy Pet Cog Winder Happy Pet Cog Winder – A durable, hygienic and brightly coloured cage toy. Designed to stimulate all the senses, keeping birds entertained and active all day long. You can hook the Cog Winder toy onto a perch or the roof of the cage and is also available in small and large. When your bird lands on the Cog Winder’s rotating perch they will then turn the cogs inside the toy. Surely provides a great source of enrichment to your bird’s enclosure.