Cascade Wild Bird Feeders Helical design mimic flower clusters in nature, providing a Natural Feeding Pattern for birds. The unique design is inspired by the recognizable DNA strand pattern and provides a delightful filling experience as nectar or seed cascades down through the helical shape. The helical shape allows room for more birds, and more room for a single bird to roam up and down the yellow flower-shaped ports like they do in nature. The Cascade Feeders are made from robust engineering resins 250 times the strength of glass, yet less than half the weight. The robust, yet lightweight feeders are designed for birds and enjoyed by humans.