I've added another photo of the rear end, if that helps? I've taken segmented photos, and I cannot see any pink? There is a tiny red dot on one of the segments.
Aaaaahhhhhh - I almost did, but got worried because I didn't think I'd know what to feed it etc (childhood memories of unsuccessful captures, I think). Sorry.
If it was wandering about, it was probably mature and seeking only somewhere nice to pupate. Quite easy to look after. A clean bottle, with dead leaves in the bottom, and fabric across the top held by an elastic band. There are 74 named species in Anthelidae, but we only know the caterpillars of 22 of them. We need people to rear any caterpillars that they find.