British conservationist joins annual swan migration

Between 1995 and 2010, the number of swans making the annual flight from Arctic Russia to northern Europe took a dive, from 29,000 to just 18,000 - a drop of more than one-third. To find out why, British conservationist Sacha Dench strapped on a paramotor, a powered paraglider, and joined the swans' migration. Jonathan Vigliotti reports.

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