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Source: http://www.bbc.co.uk/news/uk-england-london-17907874
1 May 2012 Last updated at 12:41 ET
Warning over rise in London's toxic caterpillar population
Oak processionary caterpillar The poisonous hairs can be carried on the wind
An invasive species of moth caterpillar that can cause allergic reactions has continued to spread through London, prompting a fresh warning to residents.
The oak processionary caterpillars become more of a health risk in May in the final stages before becoming moths.
Each insect is covered in thousands of toxic hairs, which can cause irritation to eyes and throats and skin rashes.
In 2007, the Forestry Commission collected and destroyed 708 nests. The figure rose to 4,410 in 2011.
The Forestry Commission, health authorities and affected boroughs are attempting to contain the growing outbreak...
1 May 2012 Last updated at 12:41 ET
Warning over rise in London's toxic caterpillar population
Oak processionary caterpillar The poisonous hairs can be carried on the wind
An invasive species of moth caterpillar that can cause allergic reactions has continued to spread through London, prompting a fresh warning to residents.
The oak processionary caterpillars become more of a health risk in May in the final stages before becoming moths.
Each insect is covered in thousands of toxic hairs, which can cause irritation to eyes and throats and skin rashes.
In 2007, the Forestry Commission collected and destroyed 708 nests. The figure rose to 4,410 in 2011.
The Forestry Commission, health authorities and affected boroughs are attempting to contain the growing outbreak...