Conservation group warns species threatened by exploding populations of grey squirrels who carry lethal virus

Red squirrels will soon disappear from England unless the government funds a vaccine against squirrelpox, one of the biggest groups set up to protect the species has warned.

Conservationists say the English population of non-native grey squirrels has exploded this year, triggered by warmer winters which enable mating pairs to feed and breed all year round, and estimate that 70% are carrying squirrelpox, a virus which is lethal only to red squirrels.