"Over The Garden Wall With Oaky" Today I want to help you to prevent Herons from feasting on your precious Koi Carp. Herons are undoubtedly the most beautiful, elegant and majestic of any marshland and wading birds, but they have one major flaw. Herons simply love to feast on Koi, and where better to find Koi than an unattended Koi pond in your garden? To a Heron your well-stocked Koi pond is like being handed a free supermarket trolley dash around the fish section, to a Heron your beautiful Koi pond represents, a secluded free, and private dinning area, stocked to the gunnels with succulent fish, just sitting there waiting to be eaten.