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"Once thought of as pillars of monogamy in the animal kingdom, it appears the flame of love can burn out for swans as well. For the first time in 40 years, after following some 4 thousand swans at a reserve in the UK, researchers discovered one formerly"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/natural-sciences/rare-swan-divorce-puzzles-researchers.html>