Green caterpillar

Green caterpillar

Observation - Green caterpillar. Description: Green caterpillar feeding on either a campion or Hound's-tongue? It was about 15mm big max and had tiny white lines dotted down the middle?

Green caterpillar feeding on either a campion or Hound's-tongue? It was about 15mm big max and had tiny white lines dotted down the middle?