After keeping eagles, great blue heron, and raccoons at bay and away from the koi in my pond for several years.. it was a river otter that went to town over the course of two nights and created total annihilation. He'd get in under the netting, catch a koi..even very large ones, haul them out onto the side.. take a bite or two and head back for another.
Removed the ones that were left and gave them away. Now I stock my pond with $1.00 young trout and let the critters have what they want. The trout are many times smarter and faster than the koi ever were.
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