Feb. 21, 2012
Peter Slater, professor of Natural History at the University of St. Andrews in Scotland, likens a group of plain-tailed wrens' chorus to a rugby teams' chant before a game.
NOVA: Flying Cassanovas

Ireland rugby team scrum down with the Pumas. (Paolo Camera/Flickr)
Peter Slater, professor of Natural History at the University of St. Andrews in Scotland, likens a group of plain-tailed wrens' chorus to a rugby teams' chant before a game.
NOVA: Flying Cassanovas
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