Magpies. They are very common in Korea, much more common than their fellow corvids the crows, probably because the two genera occupy overlapping niches and compete for the same sorts of resources, and for whatever reason, magpies happened to have largely outcompeted crows in Korea.
And like crows, magpies are known to be highly territorial. They will aggressively defend their nests and home turfs.
Which is why it's unusual to see a single tree with two magpie nests, let alone three. Maybe they were built by multiple generations of birds.
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