Caterpillar (Looper)??

Caterpillar (Looper)??

Observation - Caterpillar (Looper)?? - UK and Ireland. Description: Spotted on a plum tree in our garden. I've had someone tell me it's a kind of Looper caterpillar.

Spotted on a plum tree in our garden.

I've had someone tell me it's a kind of Looper caterpillar.