I found this caterpillar in my neighbours garden and wondered if anyone knew what it was. Its currently in a butterfy habitat which we got from a butterfly kit hiding under some leaves and i think it is making a home.
It is an Oak Eggar Lasiocampa quercus. If it was found this month, then it is probably the so-called Northern Eggar, which has a two year life cycle, and spends its second winter as a pupa. Ivy is often used as a foodplant.