Silver Y caterpillar

Silver Y caterpillar

Observation - Silver Y caterpillar - UK and Ireland. Description: This is the 2nd time I've self-found a Silver Y and the first time I didn't even realise what I had seen until I looked through photos recently. And that was 3 years ago! Two of these caterpillars were swept from fresh nettles that are about 3 weeks old

This is the 2nd time I've self-found a Silver Y and the first time I didn't even realise what I had seen until I looked through photos recently. And that was 3 years ago!
Two of these caterpillars were swept from fresh nettles that are about 3 weeks old. I presume the larvae overwintered and recently emerged.