moth larva

moth larva

Observation - moth larva - UK and Ireland. Description: Found on birch. Bright yellow line down back caught my eye. Assumed defensive position when I looked closer. Still quite small, (about 10mm), so could this be larva of second generation?

Found on birch. Bright yellow line down back caught my eye. Assumed defensive position when I looked closer. Still quite small, (about 10mm), so could this be larva of second generation?