The herons that migrate breed in their northern home then fly south to bask in our sunshine during the cold months. Winter in our area is the most dangerous time of year for the inhabitants of our backyard ponds. There are no plants in the water for fish to hide in. There are no leaves on the trees to conceal the pond from overhead view. By studying the Great Blue Heron's eating and mating habits we can install safeguards to minimize their threat to our ponds.
Herons pick their partners in early spring.
A heron decoy placed by the pond during March and April can actually draw a male in search of a mate. It's best to wait until May to put out the decoy. The decoy IS a very effective method in May through February because once he picks his mate the heron then defends his territory. Herons stay out of other herons' defended territories when not in search of a mate. Remember when you use a decoy to periodically move it around to keep up the appearance of a live bird.