Magpies. They are very common in Korea, much more common than their fellow corvids the crows, possibly because the two genera occupy overlapping niches and often compete for resources, and for whatever reason, magpies have largely outcompeted crows in Korea.
And like crows, magpies are known to be highly intelligent and territorial. They will aggressively defend their 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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