Happy Hen Treats Treat for Pets, Mealworm and Sunflower, 5.5-Ounce - 4 PACK. Happy Hen Treats Mealworm & Sunflower Treat Square for Chickens is a delicious treat square that combines all the stuff chickens love to eat. It's a premium snack that helps reduce boredom and pecking as the chickens enjoy high-protein mealworms and sunflower kernels. The Happy Hen Treats Mealworm & Sunflower Treat Square fits into the Happy Hens treat basket so you can easily hang it in your chicken coop or run. Place it low enough for chickens to reach but high enough for a fun challenge.