TJ Rich / Small eggar (Eriogaster lanestris) caterpillar larval tent on Blackthorn (Prunus spinosa) bush. Martin Down National Nature Reserve, Hampshire, England, UK. June.

TJ Rich / Small eggar (Eriogaster lanestris) caterpillar, two basking on larval tent on Blackthorn (Prunus spinosa). Martin Down National Nature Reserve, Hampshire, England, UK. June.

David Kjaer / Small eggar moth (Eriogaster lanestris) communal web of caterpillars, Dorset, UK, June.

David Kjaer / Small eggar (Eriogaster lanestris) communal web of caterpillars, Dorset, UK, June.

Philippe Clement / Caterpillar larvae of Small Eggar moth (Eriogaster lanestris) living gregariously in silken web on Hawthorn (Crataegus monogyna). La Brenne, France, April.

Robert Thompson / Small eggar moth (Eriogaster lanestris) Monmurray, County Fermanagh, Northern Ireland, UK, February

Robert Thompson / Caterpillar larva of Small eggar moth (Eriogaster lanestris) Umbra NNR, County Londonderry, Northern Ireland, UK