* The new bypass could prove a lifeline for one of Britain s most threatened butterflies. * The Hertfordshire and Middlesex branch of the charity Butterfly Conservation believe the road s chalk embankments could accommodate the Small Blue butterfly, a spe
* The new bypass could prove a lifeline for one of Britain's most threatened butterflies.
* The Hertfordshire and Middlesex branch of the charity Butterfly Conservation believe the road's chalk embankments could accommodate the Small Blue butterfly, a species not seen in Hertfordshire since 2003.
* Members have successfully campaigned to have kidney vetch, the food of the Small Blue's caterpillars, grown alongside the road.
* Branch member Andrew Palmer said: "The bypass provides one of the largest areas of exposed chalk in the county. It constitutes a very significant butterfly habitat in an area where such conditions have become increasingly rare.
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