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A SWAN HAS HIS REASONS...

The reason for the male swan's aggression was on the lake island - his mate sitting on their nest. I think this pair had only just started sitting, because this aggression usually wears off during their long incubation period. Another male swan on the river was behaving in the same way, but although the nest was built, there was no sign of his mate, so they had not even laid their eggs yet, and he was vigorously defending an empty nest.

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