Beekeepers and demonstrators march on Parliament
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Bee campaigners march on Parliament

26 April 2013 Last updated at 15:00 BST

Environmental campaigners think that a commonly used pesticide, which creates havoc with bees' sense of direction, is to blame for declining numbers.

Campaigners have marched on Parliament ahead of a key vote to ban the chemical in the European Commission next week.

Jeremy Cooke reports.