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I went there with a hunch... I was able to confirm that quite a large number of frogs had been released into the artificial pond. Please be careful and do your research before releasing the creatures you raise at home. There was even a sign saying that this was a place where frogs spawned and many frogs came out, but I heard that the frogs disappeared after crayfish appeared. I haven't seen it myself, but I think that an invasive species was preying on our protected species. It's a shame.