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Water Wiggler attracts birds - not mosquitos! Moving water attracts birds. Water Wiggler works great to attract birds and helps prevent the spreading of West Nile virus by eliminating stagnant water in birdbaths. Water Wiggler's unique agitator action creates continuous ripples in water, preventing mosquitos from laying eggs in bird baths. Easy to install. Just place in bird bath and go! No wiring and no plumbing. Operates silently on two D-cell batteries for up to two months of continual use. Operates 24 hours a day. May also be used with heated bird bath in winter.