Scientists have debated for years whether instances where an animal deliberately claims its own life because of depression can be classed as suicide.
But examples dated back to 1855, when the illustrated London News reported a dog who had thrown itself into the water to drown and had repeated the action several times until passers-by finally allowed to sink.
There have also been numerous cases of ducks apparently drowning themselves after the death of a mate.
View photos of the swan committing suicide:
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