Caterpillars on Birch tree

Caterpillars on Birch tree

Observation - Caterpillars on Birch tree - UK and Ireland. Description: Group of large hairy caterpillars (c. 7cm long) on silver birch in garden, climbing upwards and stripping leaves.

Group of large hairy caterpillars (c. 7cm long) on silver birch in garden, climbing upwards and stripping leaves.